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Q.

A ray of light incident on one refracting face of a prism of angle 750. It undergoes total internal reflection at the second face. If μ=2, the maximum angle of incidence on the first face is

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a

450

b

300

c

600

d

900

answer is A.

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Detailed Solution

minimum value of r2=ic is 450 as μ=2then r1 =A-r2 will be 750-450=300according to Snell's law sini1sinr1=2sini1=2sin300=12i1=450
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A ray of light incident on one refracting face of a prism of angle 750. It undergoes total internal reflection at the second face. If μ=2, the maximum angle of incidence on the first face is