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Q.

The speed of light in media M1 and M2 is 1.5x108m/s  and   2x 108m/s  respectively. A ray of light enters from medium M1 to M2 at an incidence angle i. If the ray suffers total internal reflection, the value of i is :

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a

equal to or less than Sin-1 35

b

equal to or greater thanSin-134

c

less than  Sin-123

d

equal to Sin-123

answer is B.

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Detailed Solution

Sin C =μrarerμdenser=  VdenserVrarer   as V∞1μ Sin C= 1.52=34 i≥C
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