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A biconvex lens of refractive index "1.5...

A biconvex lens of refractive index "1.5" has a focal length of "20cm" in air.Its focal length when immersed in a liquid of refractive index "1.6" will be:

A

-16 cm

B

`+16cm`

C

`-160cm`

D

`+160cm`

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