Question is based on the following paragraph.

An initially parallel cylindrical beam travels in a medium of refractive index  \mu (I)=\mu _{0}+\mu _{2}I,where\;\mu _{0}\; and\; \mu _{2} are positive constants and I is the intensity of the light beam. The intensity of the beam is decreasing with increasing radius.

Question: The initial shape of the wavefront of the beam is 

  • Option 1)

    planar

  • Option 2)

    convex

  • Option 3)

    concave

  • Option 4)

    convex near the axis and concave near the periphery

 

Answers (1)

As we learnt in

Refractive index -

\mu = \frac{c}{v}
 

- wherein

c= speed of light in vacuum.

v= speed of light in medium.

 

 For a parallel cylindrical beam, wavelength will be planar.

Correct option is 1.

 


Option 1)

planar

This is the correct option.

 

Option 2)

convex

This is an incorrect option.

Option 3)

concave

This is an incorrect option.

Option 4)

convex near the axis and concave near the periphery

This is an incorrect option.

Preparation Products

Knockout JEE Main April 2021

An exhaustive E-learning program for the complete preparation of JEE Main..

₹ 22999/- ₹ 14999/-
Buy Now
Knockout JEE Main April 2022

An exhaustive E-learning program for the complete preparation of JEE Main..

₹ 34999/- ₹ 24999/-
Buy Now
Test Series JEE Main April 2021

Take chapter-wise, subject-wise and Complete syllabus mock tests and get in depth analysis of your test..

₹ 6999/- ₹ 4999/-
Buy Now
JEE Main Rank Booster 2021

This course will help student to be better prepared and study in the right direction for JEE Main..

₹ 13999/- ₹ 9999/-
Buy Now
Test Series JEE Main April 2022

Take chapter-wise, subject-wise and Complete syllabus mock tests and get an in-depth analysis of your test..

₹ 6999/-
Buy Now
Boost your Preparation for JEE Main 2021 with Personlized Coaching
 
Exams
Articles
Questions