JEE Main 2018PhysicsRay OpticsEasyMCQ

JEE Main 2018 — Ray Optics Question with Solution

JEE Main 2018 (16 Apr Online)

Question

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

Choose an option

Show full solutionCorrect option: B
Correct answer
B 90°

Step-by-step explanation

Incidence angle on one face of a prism, i=60°. Angle of the prism, A=30°,

the mergent ray that makes an angle 30° with incident ray. We know, deviation angle, δ= Angle between the incident ray and emergent ray=30°

⇒δ=i+e-A
⇒30°=60°+e−30∘
⇒e=0°. So, the angle with the face, =90° .

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About this question

This is a previous-year question from JEE Main 2018, covering the Ray Optics chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.