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Q.

Light takes time t1 to travel a distance x1 in vacuum and the same light takes time t2 to travel a distance x2 in a medium. The critical angle for that medium is 

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a

sin−1x1t1x2t2

b

sin−1x2t2x1t1

c

sin−1x2t1x1t2

d

sin−1x1t2x2t1

answer is D.

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Detailed Solution

μ=x1t1x2t2=x1t2x2t1

Sinc=1μ=x2t1x1t2

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