CBSE CLASS X IMPORATANT MCQ'S IN REFRACTION OF LIGHT, Exercises of Physics

Download CBSE CLASS X IMPORATANT MCQ'S IN REFRACTION OF LIGHT and more Exercises Physics in PDF only on Docsity! JAI GURU DEV MAHARISHI VIDYA MANDIR SR.SEC.SCHOOL PHYSICS CLASS : X REFRACTION OF LIGHT WORKSHEET I. Answer in one word. 1.If a ray of light goes from a denser medium to rarer medium ,will it bend towards the normal or away from the normal? 2.state two effects caused by the refraction of light. 3.write the relation between the angle of incidence and the angle of refraction for a medium. 4.what is the unit of refractive index? 5.which has higher refractive index: water or glass ? 6The refractive index of diamond is 2.42. what is the meaning of this statement in relation to the speed of light? II. short answer type questions. 7.state the refraction of light.. 8.state two laws of refraction of light . 9.A ray of light travelling from air into crown glass strikes the surface at an angle of 30 degree. What will the angle of refraction ? 10.Light travels from a rarer medium 1 to a denser medium 2 ,the angle of incidence and refraction are respectively 45 degree and 30 degree . Calculate the refractive index of second medium with respect to the first medium. 11.The refravtive index of water with respect to air is 4/3.What is the refractive index of air with respect to water. 12.The refractive index of glass is 1.5 .Calculate the speed of light in glass . The speed of light in air is 3.0 x 10^8m/s III. Long answer type questions. 12.Explain with the help of the labelled ray diagram why a pencil is partially immersed in water appears to be bent at a water surface. 13.with the help of a diagram show how when light falls obliquely on the side of a rectangular glass slab the emergent ray is parallel to the incident ray. Show the lateral displacement of the ray on the diagram . State two factors on which lateral displacement of the emergent ray depends. Answer Key 1.When light travels from a denser medium to rarer medium ,it bends away from the normal. 2. *An object placed under water appears to be raised. * The stars appear twinkle on a clear night. * A stick obliquely and partly immersed in water appears to be bent at the water surface. 3.Refractive index of a medium =The ratio of sine of angle of incidence to the ratio of the sine of angle of refraction. 4. Refractive index is a mere number. It has no S.I. units 5.Light moves slower in glass, so, glass has a higher refractive index than water. II.SHORT ANSWER TYPE QUESTIONS 7.Refraction of light is the change in the direction of ray of light as it passes from one medium to another. 8.*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. *the ratio of sine of angle of Incidence to ratio of the sine of angle of refraction is a constant, for the given pair of media 9.A ray of light travelling in air strikes .the surface of glass of angle of 30 degree. The angle of refraction will be less than 30 degree. 10.Angle of incidence I = 45degree Angle of refraction r = 30 degree Refractive index of a medium = sin 45/sin30 =1/2^ /1/2 = 2/2^=2^X2^/2^=2^ 11.Refractive index of air with respect to water = 1/Refractive index of air with respect to air = ¾ = .75