ISC (Science) ISC Class 12 - CISCE Important Questions

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.

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.

Define coherent sources of light

In Young’s double slit experiment, show graphically how the intensity of light varies with distance

What should be the path difference between two waves reaching a point for obtaining constructive interference in Young’s Double Slit experiment ?

Derive the law of reflection using Huygen’s Wave Theory. 

Draw a neat labelled diagram of Young’s Double Slit experiment. Show that `beta = (lambdaD)/d` , where the terms have their usual meanings (either for bright or dark fringe).

With what type of source of light are cylindrical wave fronts associated?

How is the fringe width of an interference pattern in Young's double-slit experiment affected if the two slits are brought closer to each other?