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Acids, Bases And Salts

Question
CBSEENSC10012930
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How does the focal length of a convex lens change if monochromatic red light is used instead of blue light?

Solution
Relation between focal length and refractive index is as follows:
                            f∝1n-1

Refractive index of red light is less than the refractive index of blue light.

i.e.,                       nR < nv

So, the focal length of the lens will increase when red light is used. 

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