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If the refractive index of convex lens a...

If the refractive index of convex lens and surrounding medium be `mu_1` and `mu_2` respectively then for convex lens to act as concave lens when

A

`mu_1=mu_2`

B

`mu_1gtmu_2`

C

`mu_1ltmu_2`

D

`mu_1=1`

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