ICSE 2009 Solved Important Papers of Physics By Mr. M.P.Keshari

ICSE Guess > ICSE Papers > Important Questions > Class X > 2009 > Physics > Physics By Mr. M.P.Keshari

Refraction at Plane Surfaces [NUMERICALS] (Solved)

Numerical – 1. The velocity of light in diamond is 121,000 km s^-1. What is its refractive index ? (velocity of light in vacuum/air = 3 × 105 m s^-1). 

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Numerical – 2. Calculate the velocity of light in a glass block of refractive index1.5. (velocity of light in air = 3 × 10⁸ m s^-1). 

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Numerical – 3. If the refractive indices for a ray passing from air to water and from water to air, are denoted by symbols aμw and wμa respectively, write down the relation between aμw and wμa. If wμa = 0.75, what will be the magnitude of aμw.

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Numerical – 4.A glass-slab 2.5 cm thick is placed over a coin. If the refractive index of glass is 3/2, find the height through which coin is raised. 

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Numerical – 5. If the speed of light in vacuum is 3 × 10⁸ m s^-1 and refractive index of water is 4/3, calculate the speed of light in water ?

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