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A lens behaves as a converging lens in a...

A lens behaves as a converging lens in air `(mu_alpha = 1)` and diverging lens inwater `(u_omega = 1.33)`. The refractive index `mu` of the material of the lens is

A

`mu=1`

B

`mu= 1.33`

C

`1 lt mu lt 1.33`

D

`mu gt 1.33`

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