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JEE Advanced 2020Paper 1
Exam
JEE Advanced
Year
2020
Paper
Paper 1
Subject
Physics
Chapter
Wave Optics

JEE Advanced 2020 · Paper 1 · Physics · Wave Optics

A parallel beam of light strikes a piece of transparent glass...

A parallel beam of light strikes a piece of transparent glass having cross section as shown in the figure below. Correct shape of the emergent wavefront will be (figures are schematic and not drawn to scale)

A parallel beam of light strikes a piece of transparent glass having cross section as shown in the figure below.

Options

  1. AA particle is released from height S from the surface of the Earth. At a certain height its kinetic energy is three
  2. BA particle is released from height S from the surface of the Earth. At a certain height its kinetic energy is three
  3. CA particle is released from height S from the surface of the Earth. At a certain height its kinetic energy is three
  4. DA particle is released from height S from the surface of the Earth. At a certain height its kinetic energy is three

Correct answer

A. A particle is released from height S from the surface of the Earth. At a certain height its kinetic energy is three

Step-by-step solution

As we can see that the thickness of the transparent glass is minimum for the rays which are in the middle portion. So these will have the minimum optical path and the rays on the extreme ends will have to cover the maximum optical path length. Hence, the wavefront of wave 2 will be ahead of waves 1 and 3. A parallel beam of light strikes a piece of transparent glass having cross section as shown in the figure below.
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