Q.

A thin convex lens of focal length ‘f’ is cut into two halves along a vertical plane. Then the two halves are kept in contact with their curved surfaces in contact.  Then the continued focal length is

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a

f2

b

f

c

2f

d

4f

answer is B.

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Detailed Solution

1f1=12f+12f=22f=1f ∴f1=f
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A thin convex lens of focal length ‘f’ is cut into two halves along a vertical plane. Then the two halves are kept in contact with their curved surfaces in contact.  Then the continued focal length is