First slide

Prism

Question

In dispersion without deviation

Moderate

A

The emergent rays of all the colours are parallel to the incident ray
B

Yellow coloured ray is parallel to the incident ray
C

Only red coloured ray is parallel to the incident ray
D

All the rays are parallel, but not parallel to the incident ray

Solution

Deviation is zero only for a particular colour, it is generally taken to be yellow.

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