The refractive index of the material of a prism is and the angle of the prism is 30o. 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
30o
45o
60o
zero
As we have learned
Angle of deviation through prism -
- wherein
angle of incidence
angle of emergence
angle of prism
Option 1)
30o
This is incorrect
Option 2)
45o
This is correct
Option 3)
60o
This is incorrect
Option 4)
zero
This is incorrect