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A thin convergent glass lens (n= 1.5) ha...

A thin convergent glass lens `(n= 1.5)` has a power of `+5.0 D`. When this lens is immersed in a liquid of refractive index `n_1` it acts as a divergence lens of focal length 100 cm. The value of `n_1` should be :

A

`3//2`

B

`4//3`

C

`5//3`

D

2

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