A prism of refractive index 
and refracting angle is 45° is placed in air. One of the two refracting surfaces of the prism is silvered and a ray of monochromatic light enters the prism from the other face at an angle 
. If the ray retraces its path, then what is the value of 9 (in degree)?
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60
The monochromatic ray of light will retrace its path if it strikes the mirror perpendicularly.
Using Snell's law of refraction,
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