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A lens behaves as diverging lens in air ...

A lens behaves as diverging lens in air `(n = 1)` and converging lens in water `(n = 1.3)`. The refractive index n of the material of the lens is :

A

`1.0 ltnlt1.3`

B

`ngt1.3`

C

`nlt1.0`

D

`n=(1.0+1.3)/2`.

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