ISC (Science) ISC Class 12 - CISCE Important Questions

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.

Name any two phenomena which take place in the formation of a rainbow.

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 ______.

The focal length of a double convex lens is equal to the radius of curvature of either surface. What is the refractive index of its material?

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.