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Q.

The focal length of a biconvex lens is f. If we cut the lens into two equal pieces as shown in the figure, the focal length of each piece will be
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a

f/2

b

f

c

0

d

1

answer is B.

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Detailed Solution

By cutting the lens along its principal axis, the radius of curvature ad refractive index of lens does not change. Thus, focal length as per Lens Makers formula remains same.

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