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Q.

Two identical glass (μg = 3/2) equiconvex lenses of focal length f each are kept in contact. The space between the two lenses is filled with water (μw = 4/3). The focal length of the combination is:

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a

3f/4

b

4f/3

c

f/3

d

f

answer is B.

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Detailed Solution

for equi convex lens of glass
f=R2(μ−1)⇒f=R232−1⇒f=R…f1=−R243−1=−3R2=−3f2Now 1feq=1f+1f1+1f=1f−23f+1f⇒feq=3f4

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