When a white light ray falls on a prism, the ray at its first surface suffers.

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Solution

When a white light ray falls on the first surface of a prism, light rays of different colours due to their different speeds in glass get refracted (or deviated) through different angles. Thus, the dispersion of white light into its constituent colours takes place at the first surface of prism.

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Similar questions

When a white light ray falls on a prism, the ray at its first surface suffers :

(a) no refraction

(b) only dispersion

(d) both deviation and dispersion.

In refraction of light through a prism, the light ray:

(a) suffers refraction only at one face of the prism

(b) emerges out from the prism in a direction parallel to the incident ray

(d) bends at both the surfaces of prism opposite to its base

Q. A ray of white light falls on a prism. Draw a ray diagram to show that the prism disperses the white light.

A light ray falls on one of the faces of a prism at an angle 40 so that it suffers minimum deviation of 30 degrees. Find the angle of prism and angle of refraction at the given surface.

AB

is a white light ray incident on the prism

PQR

as shown below.
Complete the ray diagram when the light passes through it and falls on the adjacent screen.

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