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The focal length of a plano convex lens ...

The focal length of a plano convex lens is `f` and its refractive index is 1.5. It is kept over a plane glass plate with its curved surface touching the glass plate. The gap between the lens and the glass plate is filled by a liquid. As a result, the effective focal length of the combination becomes `2f`. Then the refractive index of the liquid is.........

A

1.33

B

1.25

C

2

D

1.5

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