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  4. When monochromatic red light is used instead of blue light in a convex lens, its focal length will :

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Q. When monochromatic red light is used instead of blue light in a convex lens, its focal length will :

AIEEEAIEEE 2011Ray Optics and Optical Instruments

Solution:

$\mu_{R} < \mu_{B}$
$\frac{1}{f} = \left(\mu-1\right) \left(\frac{1}{R_{1}}-\frac{1}{R_{2}}\right)$
$\frac{1}{f_{B}} > \frac{1}{f_{R}}$
$f_{R} > f_{B}.$