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A convex lens when placed in a certain m...

A convex lens when placed in a certain medium does not at all act as a lens. The refractive index of lens is `n_1` and that of medium is `n_2`. the relation between `n_1` and `n_2` is

A

`n_1 gt n_2`

B

`n_1 lt n_2`

C

`n_1 = n_2`

D

None of the above.

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