ISC (Science) ISC Class 12 - CISCE Question Bank Solutions

The deviation produced for violet, yellow and red lights for crown glass are 3.75°, 3.25° and 2.86° respectively. Calculate the dispersive power of the crown glass.

A ray of light is incident on a prism whose refractive index is 1.52 at an angle of 40°. If the angle of emergence is 60°, calculate the angle of the prism. 

In a regular prism, what is the relation between angle of incidence and angle of emergence when it is in the minimum deviation position?

Calculate dispersive power of a transparent material given : n_v = 1.56, n_r = 1.54, n_y = 1.55. 

 A narrow beam of monochromatic light, PQ, is incident normally on one face of an equiangular glass prism of refractive index 1.45. When the prism is immersed in a certain liquid, the ray makes a grazing emergence along the other face (See figure). Find the refractive index of this liquid. 

 What is meant by the dispersive power of transparent material?

Define angular dispersion.

The refractive indices of material for red, violet and yellow colour light are 1.52, 1.62 and 1.59 respectively.
Calculate the dispersive power of the material. If the mean deviation is 40°. What will be the angular dispersion produced by a prism of this material?

Prove that in case of a prism, i + e = A + δ, where the symbols have their usual meanings.

For any prism, obtain a relation between the angle of the prism (A), the angle of minimum deviation (δ_m) and the refractive index of its material (μ or n).

When a ray of white light is incident obliquely on the first surface of a prism, then ______.

What is meant by a thin prism?

1. A virologist studies details of a virus with the help of an instrument. Name the instrument used by him.
2. Draw a labelled ray diagram of an image formed by this instrument, assuming
   1. a small upright object.
   2. image lies at least distance of distinct vision.