If the refractive index of crown glass is 1.51, its critical angel is.

If the refractive index of crown glass is 1.51, its critical angel is.
  • A.
    48.6°
  • B.
    22.5°
  • C.
    41.5°
  • D.
    45.0°
Correct Answer: Option C
Explanation

Sin c = (1)/n
= (1)/1.51 = 0.6622
∴ c = sin +0.6622 = 41.47

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