Class X Science Notes for Light - Reflection and Refraction • Light is a form of energy that produces in us the sensation of sight. Light: It is a form of energy which produces the sensation of sight. To learn more on this topic please register with us When a ray of light falls on any object (polished, smooth, shiny object), light from that object bounces back those rays of light to our eyes and this is known as "Reflection" or "Reflection of Light". Question 4. Best coaching center in A Best coaching center in Ara Bhojpur | Now in your city Ara |Top institute in Ara for your children's VIDYA MANDIR ACADEMY Ara best . As you can see the picture given below, that in it the ray is striking the surface and then it bounces back. Question 1. The process of bouncing back light rays which fall on the surface of an object, is called the reflection of light. Total internal reflection definition: TIR (total internal reflection) is an optical phenomenon in which waves, such as light, are entirely reflected when they reach the boundary between two mediums, such as air and water, under particular conditions. 09 Aug, 2017 Study Material and Notes of Ch 10 Light - Reflection Class 10th Science Topics in the Chapter • Introduction • Properties of Light • Reflection → Laws of Reflection → Virtual and Real image • Image formed by Plane mirror → Characteristics of image formed by Plane mirror → Lateral inversion and its application • Spherical Mirrors There are two laws of reflection: 1) The incident ray, reflected ray and normal lie on the same plane. (a) Define focal length . Light Reflection and Refraction Class 10 Important Questions Short Answer Type II. Made by: SHREYAANS M. NAHATA PODAR INTERNATIONAL SCHOOL, JALGAON [10TH RUBY 29] 1. Important Points in using Magnification Formula. How far is the object placed from the lens? Plain Mirror. In this chapter we will study the phenomena of reflection and refraction using the property of light i.e. . i.e. (ii) Ratio of sine of angle of incidence to the sine of angle of refraction is a constant quantity. According to the second law of reflection, angle of incidence is equal to the angle of reflection. What will be the : How to use reflection in a sentence. A plane mirror reflects almost all the light that falls on it. When a light ray is incident on the surface separating two media, the direction of the ray changes. Laws of Refraction. Direct link to Divija R's post "There are two laws of ref.". Before, after and during reflection light travels in a straight line. ii) The incident ray, the reflected ray and the normal to the mirror at. Therefore, angle of incidence= 90 0 -40 0 =50 0. (ii) between the pole P and focus F of a concave mirror. Refraction makes it possible for us to have optical instruments such as magnifying glasses, lenses and prisms. CBSE Class 10 Science Chapter 10 Light - Reflection and Refraction Notes Properties Of Light An electromagnetic wave so does not require any medium to travel Light tends to travel in a straight line Light has dual nature i.e., wave as well as particle Light casts shadow Speed of light is maximum in vacuum. Regular reflection occurs at the surface of a plane surface like a plane mirror. 2. 2 ) When the incident ray of light is appeared t be passed through the focus, after reflection it . Non-luminous objects: These are the objects which do not emit light of their own. Answer: (i) Let v 1 = speed of light in air, v 2 = speed of light in glass, then . It is represented by a straight line with an arrow marked on it.Beam of light: A group of light rays is called a beam of light. In order to study and observe the reflection of light, we need an apparatus that can produce a thin beam of light. (i) The incident ray, the refracted ray and the normal to the interface of two transparent media at the point of incidence, all lie in the same plane. Light Reflection and Refraction HOTS Questions With Answers. Clearly when, focal length, f = 1 m Glass. Draw the ray diagram. The speed of light is maximum in the vacuum. Due to this, the direction of light changes at the interface of two different media. Definition: When light rays are incident on an opaque polished surface (medium), these are returned back in the same medium. Gujarat Board Textbook Solutions Class 10 Science Chapter 10 Light Reflection and Refraction Gujarat Board Class 10 Science Light Reflection and Refraction InText Questions and Answers. When a beam of rays starting from a point source of light suffers a change in direction due to reflection or refraction, and the reflected or refracted rays actually converge or appear to diverge from another point, then the second point is called the optical image of the first point. At what distance from the lens a 5 cm tall object be placed so that it forms an image at 15 cm from the lens? a) Laws of reflection of light :- i) The angle of incidence is equal to the angle of reflection. Answer The point at which rays parallel to principal axis coming from infinity converge after being reflected from concave mirror is called the principal focus of . (ii) i + e = A + d. When you look at a mirror, you see the reflection of other things around you along with your own image. When light travels from one medium to another (like air to glass, or glass to water), it does three things. In other words, Reflection is the change in direction . Solution : Angle to the mirror surface=40 0. Reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated. Light Reflection and Refraction Extra Questions Very Short Answer Type . a) Laws of reflection of light :-. Question 1. Following are the "Laws of reflection". {10}{20}\) x 4 = 2cm. Class 10 Class 12. Define the principal focus of a concave mirror. Some of it bounces off, some of it goes through, and the rest of it is absorbed. ii) The image is same size as the object. If the surface is smooth and shiny, the light will reflect at the same angle at which it hits the surface. Focal Length: It is on the axis of . Answer: A) Sun b) flame of gas burner. Question 1. Which has a higher refractive index, glass or water? "Light is an electromagnetic ray that travels in a straight line" Reflection of Light: When light falls on a surface and is reflected back into the same medium, we say reflection has taken . An imaginary line that is perpendicular to the reflecting surface from where the reflection occurs is known as the normal. Light is a form of energy, which gives us the power of vision. We can see objects outside the room because out of the room the light is available and those rays of light enter our eyes after reflection. Question: State the law of reflection. Most of the objects reflect light which falls on them. This phenomenon is what enables us to look at the world around us based. What is its unit? This is called regular reflection and produces good images. (a) periscope (b) telescope. Define 1. the light is sent back into the same medium. What will be the : Let's explore more about this topic through this detailed blog. It is also because of the refraction of light that we are able to focus light on our retina. Extra Question (3 Marks) - Question 2 An object is placed at a distance of 60 cm from a concave lens of focal length 30 cm (i) Use lens formula to find the distance of the image from the lens Object is always placed in front of the lens Hence, object distance is negative Object distance = u = −60 cm Also, Focal length of a concave lens is . Some of it bounces off, some of it goes through, and the rest of it is absorbed. Slide 4 Ima. Light - Reflection and Refraction. Virtual image is formed when object is between F and P. Convex Mirror. Reflection of light is the simple phenomenon of the light bouncing back after falling on an object. When a ray of light approaches a smooth polished surface and the light ray bounces back, it is called the reflection of light. NCERT Questions. 22. The change in direction of light when it passes from one medium to another obliquely is called Refraction of light Note: - We write obliquely here because light should come at an angle, it should not be perpendicular to the surface Example 1 Suppose we put a pencil in a glass of water It appears to be displaced (at the place air and water meet) 2) Angle of incidence is equal to angle of reflection. Reflecting surface is flat. 2. Solution 3. Define 'refractive index of a transparent medium'. Light Reflection and Refraction Class 10 Notes Understanding the Lesson 1. We will explore what rules govern them, their technical names and then apply these rules to study the . When a ray of light falls on a mirror at point , it is sent back by the mirror in another direction . SI unit of power is dioptre (D). This process is called reflection of light. The laws of reflection are used for determining the reflection of incident rays on the reflecting surfaces. . To understand what these angles and light rays stand for, consider the . Concave Mirror. At what distance from the mirror should a screen be . Zigya App. 2. 5. Extra Questions for Class 10 Science Chapter 10 Light Reflection and Refraction with Answers Solutions. Students can also access the revision notes in PDF to study from any device and at any time according to their convenience. 5 i) The image is erect. Light - Reflection and Refraction Class 10 Physics Complete. Characteristics of light Speed of light c=λ×μ, where λ is its wavelength and μ is its frequency. Reflection of Light When light falls on a highly polished surface like a mirror most of the light is sent back into the same medium. Therefore, angle of reflection=50 0. It's twice the focus. Define principal focus of a concave mirror. 1. Totally reflecting prism has an angle of refraction. Focus: It is any point, where light rays parallel to the principal axis, will converge after reflecting from the mirror. straight line propagation (Light wave travel from one point to another, along a straight line). For example, sun, torch, etc. Refraction of light is one of the most commonly observed phenomena, but other waves like sound waves and water waves also experience refraction. Define the principal focus of a concave mirror. That is such a ray suffers no bending at the surface because here the angle of incidence is 0°. Also calculate the size of the image formed. This phenomenon is known as the Refraction of light. For example, the moon, the planets, etc. Law of Reflection Angle of incidence equals angle of reflection, Slide 5 Inddent Ima. "Reflection is the bouncing back of light rays on striking the surface". Get the answer to your question i.e. A group of light rays originating from a source and travelling in some definite direction is known as a beam of light. Bouncing back of light rays after hitting any surface is called reflection of light. Different beams of lightThe rays from a distant light source (such as the sun) are . known as refractive index of the medium. [Delhi] CBSE Class 6 Science Notes Chapter 11 Light, Shadows and Reflection. The detailed, step-by-step solutions will help you understand the concepts better and clear your . NCERT Solutions for Class 10 Science Chapter 10 Light Reflection and Refraction. When waves travelling in one medium collide with another medium with a higher wave speed (lower . Define 1. (i) Angle of incidence is always equal to the angle of reflection. NCERT Solutions for Class 10 Science Chapter 10 Light Reflection and Refraction is structured in a way to present a comprehensible coverage of scientific topics related to our daily life. Solution : Angle to the mirror surface=40 0. As we have discussed about reflection so now we are going to define it. Answer: Light rays that are parallel to the principal axis of a concave mirror converge at a specific point on its principal axis after reflecting from the mirror. Name and define the SI unit of power. CBSE Class 10 ScienceRevision NotesCHAPTER - 10LIGHT REFLECTION & REFRACTION. The angle of incidence ∠i . ii) The incident ray, the reflected ray and the normal to the mirror at the point of incidence all lie in the same plane. Light - Reflection and Refraction Class 10 Physics Complete. Made by: SHREYAANS M. NAHATA PODAR INTERNATIONAL SCHOOL, JALGAON [10TH RUBY 29] 1. Most of the images are real and inverted. Reflection of light by Subject Matter Expert at Safalta for better learning. To learn more on this topic please register with us Light - Reflection and Refraction. It is a point on the principal axis at which parallel rays of light travelling close to principal axis actually converge after reflection. Thus if angle of incidence ∠i = 0°, then the angle of refraction ∠r = 0°. There are many surfaces that show reflection but not all surfaces show reflection. (ii) Snell's law: The ratio of sine of angle of incidence to the sine of angle of refraction is a constant, for a light of given colour and for a given pair of media. Diffused reflection occurs at the surface of a rough surface like cardboard. (i) The incident ray, the refracted ray and the normal to the interface of two transparent media at the point of incidence, all lie in the same plane. In this chapter, we will explore the first two. Posted a year ago. We will explore what rules govern them, their technical names and then apply these rules to study the . This process is called. Reflected rays after regular reflection are not parallel. Real image : When the rays of light, after reflection from a mirror, actually meet at a point, then the image formed by these rays is said to be real. Common examples include the reflection of light, sound and water waves.The law of reflection says that for specular reflection the angle at which the wave is incident on the surface equals the angle at which it is reflected. In any medium, light travels with less speed. Stable Water surface. Reflection of light is the phenomenon in which the light rays strike the surface and bounce back. A concave lens of focal length 15 cm forms an image 10 cm from the lens. Answer: To see an object, we need source of light, eyes and object. If the speed of light in glass is 2 × 10 8 ms -1, find the speed of light in (i) air, (ii) water. For shorter wavelengths, the chance of scattering . When light travels from one medium to another (like air to glass, or glass to water), it does three things. Scattering of light: Scattering happens when light moves from one medium to another, such as air or a glass of water, a portion of the light is absorbed by the medium's particles, followed by subsequent radiation in a specific direction.The intensity of scattered light depends on the size of the particles and the wavelength of the light. Draw the ray diagram in each case to show the position and nature of the image formed when the object is placed: (i) at the centre of curvature of a concave mirror. n = c/v It has no unit as it is the ratio. What is LensIt is a transparent glassit is bound by 2 spherical surfacesHence, if 2 glass spheres are joined together, they form a lensWhat are Different Types of lensThey are of 2 typesConcave LensIt is thin in center but thicker at the edgesConvex LensIt is thick in middle but thinner at the edges Answer: There are two laws of reflection. The incident light ray which lands upon the surface is said to be reflected off the surface. Question 4: A ray of light is incident normally on a plane mirror. Balbharati solutions for Science and Technology 9th Standard Maharashtra State Board chapter 11 (Reflection of Light) include all questions with solution and detail explanation. Such a body becomes visible when light falls on it. ii) The incident ray, the reflected ray and the normal to the mirror at the . When we look at an object . Questions Example 10.1 - A convex mirror used for rear-view on an automobile has a radius of curvature of 3.00 m. If a bus is located at 5.00 m from this mirror, find the position, nature and size of the image View Answer Example 10.2 - An object, 4.0 cm in size, is placed at 25.0 cm in front of a concave mirror of focal length 15.0 cm. Question 2. ∠i = ∠r. One dioptre is defined as the power of a lens whose focal length is 1 metre. LONG ANSWER QUESTIONS. However speed is inversely proportional to optical density of the medium. (iv) at 2F of a convex lens. reflection of light. Question 1. Ray of light: The direction or path along which light energy travels in a medium is called a ray of light. Light exhibits dual nature i.e. • Reflection of light is the phenomenon of bouncing back of light in the same medium on striking the surface of any object. Real images can be obtained on a screen. Question 1. Its value is 3 x 10 8 m/s . Principal focus is that point on the principal axis at which, a beam of light which is incident . The most common example of this is not being able to see anything on entering a dark room but once you switch on the lights, everything will be visible. Laws of reflection of light :- i) The angle of incidence is equal to the angle of reflection. Therefore, angle of reflection=50 0. 78. Draw the ray diagram and also state the position, the relative size and the nature of image formed by a concave mirror when the object is placed at the centre of curvature of the mirror. Rules for drawing the image formed by a spherical Mirror : ( For convex mirror ) 1 ) When the rays of light parallel to the principal axis incident on the convex mirror, after reflection, the reflected rays appeared to be passed through the focus. This Blog Includes: The incident ray is the light ray that falls on the surface and the reflected ray is the light that bounces off the surface. Define the principal focus of a concave mirror? Shiny Metals. The light reflection and refraction Class 10 notes have been curated by experienced teachers strictly according to the latest NCERT syllabus to aid students in their preparation for Class 10 board examinations. Define the principal focus of a concave mirror. Formulae Handbook for Class 10 Maths and Science. The smooth & shiny surface can be: Mirror. Reflection of Light. Reflection of light by Subject Matter Expert at Safalta for better learning. 23. 1. Slide 3. It is also defined as the effective diameter of the light reflecting area of the mirror. Some objects reflect more light whereas other objects reflect less light. Get the answer to your question i.e. Rays of Light Incident Ray - leaves the object and strikes the mirror Reflected Ray - leaves mirror and strikes your eye The reflected ray is on the line of sight from the image to your eye. Page 168. Text Book Part II Page No. bounces back (reflection) passes through or bends (refraction) When light is incident on a plane mirror, most of it gets reflected, and some of it gets absorbed in the medium. Answer: It is a point on the principal axis where the rays of light parallel to principal axis meet. Reflecting surface is concave. The ray of light which is incident normally on a plane glass slab passes undeviated. Second Law: The angle of reflection is always equal to the angle of incidence. Then we see that object. Image is virtual, of same size as mirror, erect and laterally inverted. We shall try to understand in this Chapter the r eflection of light by spherical mirrors and refraction of light and their application in real life situations. The Law of Reflection states that the angle of the incident light ray is equal to the angle of the reflected light ray. Let us try to understand with examples of reflection! Laws of Refraction. The laws of reflection of light are as follows: First law: The incident ray, the reflected ray, and the normal (at the point of incidence), all lie in the same plane. (CBSE 2011) Answer: The ratio of the speed of light in the vacuum (c) to the speed of light in the given medium (v) is called refractive index. Answer: (b) Explanation: In prism, if one angle is 90° the other two will be 45 degree each and the total internal reflection is possible. 11: Give example of an object which is a) opaque and luminous b) translucent and luminous. Answer: The number of rays parallel to the principal axis are falling on a concave mirror which meat at a point is called principal focus of the concave mirror. This will clear students doubts about any question and improve application skills while preparing for board exams. Reflected rays after regular reflection are parallel. (a) 60° (b) 90° (c) 0° (d) 40°. This process is called reflection of light. When light emitted by luminous body falls on an object, it is reflected back and received by our eyes. "Light is an electromagnetic ray that travels in a straight line" Reflection of Light: When light falls on a surface and is reflected back into the same medium, we say reflection has taken . This phenomenon of returning of ray of light in the same medium, is called reflection of light. The meaning of REFLECTION is an instance of reflecting; especially : the return of light or sound waves from a surface. Define the principal focus of a concave mirror. Pole (p): Pole is the midpoint of a mirror. Question 1 Page 168 - Chapter 10 Class 10 - Light - Reflection and Refraction (Term 1) Last updated at April 27, 2020 by Teachoo. The ray of light that falls on a reflecting surface is known as the incident ray and the ray that is reflected back is known as the reflected ray. This phenomenon is known as the reflection of light. 10.1 REFLECTION OF LIGHT A highly polished surface, such as a mirror, reflects most of the light falling on it. The ray that bounces back is called the reflected ray. Answer: (i) Laws of refraction of light: (i) Incident ray, refracted ray and normal at the point of incidence all lie in the same plane. Note: Laws of reflection are valid in both the cases. For example, when we look into a plane mirror, we see our image behind the mirror. They are neither coming up out of the paper nor going down into the paper. Question 9: Totally reflecting prism is used in. Define the term principal axis of a . 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