Question

the face pr of a Prism pqr of angle 30 degree is silvered a ray is incident on face PQ at an angle of 45 degree has shown in figure the reflected ray undergoes reflection on face PR and details is its path the refractive index of the prism is

Answer 1

If the ray has to retrace its path, then The angle of incidence of ray on teh mirrormust be 90 degree. So then the angle of refraction will be 180-90-60 =30 degreeso we can write μ=sin isin r=sin 45sin 30=2

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