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Q.

fv and fr are the focal lengths of a convex lens for violet and red light respectively and Fv and Fr are the focal lengths of a concave lens for violet and red light respectively, then

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a

fvFr

b

fv

c

fv>fr and Fv>Fr

d

fv>fr and Fv

answer is B.

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Detailed Solution

According to lens makers formula 1f=(μ−1)1R1−1R2⇒1f∝(μ−1) since μRed <μviolet ⇒fv
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