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Q.

Two identical glass μg=32 equiconvex lenses of focal length  f each are kept in contact. The space between the two lenses is filled with water μw=43. The focal length of the combination is

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a

f3

b

f

c

4f 3

d

3f4

answer is D.

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Detailed Solution

water between two convex lenses can be considered as a concave lens.So, 1f=(μg-1)×2R=1Rfor concave lens power = 1f1=(μwater-1)(-2R)=-23fsolving both the equation feq=3f4
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