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Q.

Let fv and fr are the focal lengths of a convex lens for violet and red lights respectively. If 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

fc>fr  and  Fv>Fr

d

fv>fr  and  Fv>Fr

answer is B.

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Detailed Solution

According to lens makers formula1f=μ−11R1+1R2⇒1f∝μ−1since  μviolet⇒fv
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