(English Medium) ICSE Class 10 - CISCE Question Bank Solutions

What is the refractive index of water

State the relation between the refractive index μ and the velocity of light (v_m) in that medium.

What should be the ratio of the speed of light through the liquid to the speed through the glass so that there is no refraction of light at the boundaries of the glass block when the system is illuminated by the light of one colour?

Comment on the statement ‘The refractive index of glass is 3/2.’

Define the term refractive index of a medium in terms of velocity of light.

How is the refractive index of a medium related to its real depth and apparent depth?

Express the refractive index μ of a medium in terms of the velocity of light.

Explain briefly what causes the twinkling of stars at night.

Can the absolute refractive index of a medium be less than one?

Why does the sun appear bigger during sunset or sunrise?

What is the total reflecting prism?

Name two instruments of the total refracting prism in which is used.

In what condition a prism is said to be in the position of minimum deviation? What is the direction of the refracted ray inside the prism in this condition?

How does the angle of deviation produced by a prism depend on the colour of light used? Which colour of white light is deviated (i) most, (ii) least, by a prism?

What do you understand by the deviation produced by a prism?

You are provided with a printed piece of paper. Using this paper how will you differentiate between a convex lens and a concave lens?

The refractive index of air with respect to glass is defined: as _gµ_a = sin i/sin r
Write down a similar expression for _aµ_g in terms of angle i and r.

The refractive index of air with respect to glass is defined: as _gµ_a = sin i/sin r
If r = 90°, what is the corresponding angle i called?

A ray of light moves from a rare medium to a dense medium as shown in the diagram below. Write down the number of the ray which represents the partially reflected ray.

In the diagram below, PQ is a ray of light incident on a rectangular glass block.

Copy the diagram and complete the path of the ray of light through the glass block. In your diagram, mark the angle of incidence by letter ‘i’ and the angle of emergence by the letter ‘e’.