# A, B and C are three optical media of respective critical angles C_1, C_2 and C_3. Total internal reflection of light can occur from A and B and

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A, B and C are three optical media of respective critical angles C_1, C_2 and C_3. Total internal reflection of light can occur from A and B and also from B to C but not from C to A. Then the correct relation between critical angles is
A. C_1 gt C_2 gt C_3
B. C_1=C_2=C_3
C. C_3 gt C_1 gt C_2
D. C_1 lt C_2 lt C_3

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T.I.R. can occur from A to B i.e. mu_Agtmu_B.
B to C i.e. mu_Bgtmu_C
mu_Agtmu_Bgtmu_C
sinC=1/muimpliesmu=(1)/(sinC)
(1)/(sin C_1)gt(1)/(sinC_2)gt(1)/(sinC_3)
sinC_1 lt sinC_2 lt sinC_3
C_1 lt C_2 lt C_3