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QNEET-2018-Ph-912: NEET 2018 Physics - Class 12 NEET-2018-Ph-912 Solution: The refractive index of the material of a prism is \( {2}\) and …

The refractive index of the material of a prism is 2\sqrt{2} and the angle of the prism is 30∘30^\circ. 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 60∘60^\circ 45∘45^\circ 30∘30^\circ zero

Multiple Choice Options

  • A 60 0
  • B 45 0
  • C 30 0
  • D zero

Step-by-Step Verified Solution

For retracing the path, light ray should be normally incident on silvered face. Applying Snell�s law at point M, sin _ i sin _ 30 _ = 2 1 _ sin i = 2 _ 1 2 = 1 2 _ i = 45 o

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