The refractive index of the material of a prism is 
and the angle of the prism is 30°. One of the two refracting surfaces of the prism is made a mirror inwards, by silver coating. A beam of monochromatic light entering the prism from the other face will retrace its path (after reflection from the silvered surface) if its angle of incidence on the prism is -
Text Solution
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To retrace its path the ray should incident mormally on the silvered surface,
r 2 =0
r 1 =A
On applying snell's law
1 x sin i = n sin A
Sin i= 
sin 30°
i = 45°
Here e =0
(No emergence)
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