First slide

Prism

Question

When white light passes through a glass prism, one gets spectrum on the other side of the prism. In the emergent beam, the ray which is deviating least is or
Deviation by a prism is lowest for

Moderate

A

Violet ray
B

Green ray
C

Red ray
D

Yellow ray

Solution

$δ \propto (μ - 1) \Rightarrow μ_{R} is least so δ_{R} is least.$

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