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A hollow double concave lens is made of very thin transparent material. It can be filled with air or either of two liquids L_1 or L_2 having refractive indices mu_1 and mu_2 respectively `(mu_2gtmu_1gt1)`. The lens will deverge a parallel beam of light if it is filled with

A

air and placed in air

B

air and immersed in L_1

C

L_1 and immersed in L_2

D

L_2 and immersed in L_1

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The correct Answer is:
D

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