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

a)

Does not depend on colour of light

b)

Increase

c)

Decrease

d)

Remain same


Question ID - 152790 :-

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

a)

Does not depend on colour of light

b)

Increase

c)

Decrease

d)

Remain same

1 Answer
5876 Votes
3537

Answer Key : (b) -

(b)

Also, by Cauchy’s formula

Hence,



Next Question :

The nature of sun’s spectrum is

a)

Continuous spectrum with absorption lines

b)

Line spectrum

c)

The spectrum of the helium atom

d)

Band spectrum


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