Q. 5

The focal length of a converging lens are fv and fr for violet and red light respectively.
A. fv>fr

B. fv=fr

C. fv<fr

D. Any of the three is possible depending on the value of the average refractive index μ.

Answer :

Because focal length is inversely proportional to refractive index. And, refractive index is inversely proportional to .So, keeeping other parameters same,we get:

f (λr- λv)

So, fv<fr . Hence, option (C) is correct.

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