For a ray of light incident on a prism of angle A, the wrong statement is

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The angle of deviation will increase as A is increased

The angle of deviation will increase as the refractive index of the prism is increased

The angle of deviation for violet colour is more than the angle of deviation for red colour

All colours into which the ray is dispersed emerges as a parallel beam

answer is D.

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Detailed Solution

When a light ray is incident on a prism of angle A

Consider for smaller angles of A

Question Image using this relation

(i) we get deviation increases with increase of Angle A

(ii) we get deviation increases with increase of refractive index

(iii) Angle of deviation for violet colour is more than angle of deviation of red colour

Question Image

(iv) All colours into which the ray is dispersed will not emerge as a parallel beam

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