First slide

The lens

Question

Focal length of a convex lens will be maximum for

Moderate

A

Blue light
B

Yellow light
C

Green light
D

Red light

Solution

$f \propto \frac{1}{(μ - 1)} and μ \propto \frac{1}{λ} . Hence f \propto λ and λ_{T} > λ_{r}$

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