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ICSE Class X Notes 2024 : Physics (GEMS Modern Academy, Dubai)

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1 VICTORY 2024 Light 1. State the Snell s laws of refraction of light. 2. Define the term refractive index of a medium. Can it be less than 1? 3. How is the refractive index of a medium related to the speed of light in it? 4. A light ray passes from water to (i) air, and (ii) glass. In each case, state how does the speed of light change. 5. The diagram alongside shows the refraction of a ray of light from air to a liquid. DHA-01 7. The refractive index of water with respect to air is 4/3. What is the refractive index of air with respect to water? 8. A ray of light is normally incident on one face of an equilateral glass prism. Answer the following: (i) What is the angle of incidence on the first face of the prism? (ii) What is the angle of refraction from the first face of the prism? (iii) What will be the angle of incidence at the second face of the prism? (iv) Will the light ray suffer minimum deviation by the prism? 9. Write a relation for the angle of deviation ( ) for a ray of light passing through an equilateral prism in terms of the angle of incidence (i1), angle of emergence (i2) and angle of prism (A). 10. Name the colour of white light which is deviated (i) the most, and (ii) the least, on passing through a prism. (a) Write the value of (i) angle of incidence, and (ii) angle of refraction. (b) Use Snell s law to find the refractive index of liquid with respect to air. 6. The speed of light in diamond is 125,000 km s 1. What is its refractive index? (Speed of light in air = 3 108 m s 1) 11. Which of the two prisms, A made of crown glass and B made of flint glass, deviates a ray of light more?

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