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A right - angled isoceles prism is he...

A right - angled isoceles prism is held on the surface of a liquid composed of miscible solvents A and B of refractive index `n_A = 1.50 and n_B = 1.30 ` respectively . The refractive index of prism is `n_p = 1.5 ` and that of the liquid is given by ` N_L = C_A n_A +(1 -C_A) n_B` where ` C_A ` is the percentage of solventA in the liquid

IF ` theta_C` is the critical angle at prism - liquid interface . the plot which best represents the variation of the critical angle with the percentage of solvent is

A

B

C

D

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