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  4. A, B and C are three optical media of respective critical angles C1,C2 and C3 Total internal reflection of light can occur from A to B and also from B to C but not from C to A. Then, the correct relation between the critical angles is

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Q. 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 to B and also from B to C but not from C to A. Then, the correct relation between the critical angles is

KCETKCET 1997Ray Optics and Optical Instruments

Solution:

Using sin C $=\frac{1}{n}$
we get $C_1 < C_2 < C_3$ because light should travel from denser to rarer medium in this case