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Q.

The given lens is broken into four parts and rearranged as shown. If the initial focal length is ‘f’ then after rearrangement, the equivalent focal length is fx. Then x is

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answer is 2.

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Detailed Solution

Cutting a lens in transverse direction doubles their focal length i.e., 2f
Using the formula of equivalent focal length

1f'=1f1+1f2+1f3+1f4=42f=2f

f'=f2

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