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QJEEM18Ph892e: JEE Main 2018 Physics - Class 12 JEEM18Ph892e Solution: A ray of light is incident at an angle of 60 o on one face of a …

A ray of light is incident at an angle of 60o on one face of a prism of angle 30o. The emergent ray of light makes an angle of 30o with incident ray. The angle made by the emergent ray with second face of prism will be :

Multiple Choice Options

  • A 0o
  • B 90o
  • C 45o
  • D 30o

Step-by-Step Verified Solution

Given : i1=60∘; A=30∘

Then angle of deviation is given by

δ=1−A=60∘−30∘=30∘

JEE Main 2018 (Online) 16th April Morning Slot Physics - Geometrical Optics Question 186 English Explanation

We know that,

i1+i2=A+δ⇒60∘+i2=30∘+30∘⇒i2=0

It means emergent ray leaves face AC normally.

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