Focal length of a convex lens will be maximum for - Vidyadip

MCQ

Focal length of a convex lens will be maximum for

A
Blue light
B
Yellow light
C
Green light
✓
Red light

✓

Answer

Correct option: D.

Red light

d
(d) $f \propto \frac{1}{{(\mu - 1)}}$ and $\mu \propto \frac{1}{\lambda }$.

Hence $f \propto \lambda $ and ${\lambda _r} > {\lambda _v}$

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