A system of three polarizers P_{1},P_{2},P_{3} is set up such that the pass axis of P_{3} is crossed with respect to that of P_{1}. The pass axis of P_{2} is inclined at 60^{\circ} to the pass axis of P_{3}. When a beam of unpolarized light of intensity I_{o} is incident on P_{1}, the intensity of light transmitted by the three polarizers is I. The ratio (I_{o}/I) equal (nearly):

 

 

  • Option 1)

    5.33

  • Option 2)

    16.00

  • Option 3)

    10.67

  • Option 4)

    1.80

 

Answers (1)

 

Malus Law -

I= I_{0}\cdot \cos ^{2}\theta

\theta = angle made by E vector with transmission axis.

- wherein

I= Intensity of transmitted light after polarisation .

I_{0}= Intensity of  incident light.

 

 

the intensity of light transmitted from P_{1}=\frac{I_{o}}{2}

the intensity of light transmitted from P_{2}=\frac{I_{o}}{2}\cos ^{2}30=\frac{3I_{o}}{8}

The intensity of light transmitted from P_{3} 

I=\frac{3I_{o}\cos ^{2}60}{8}=\frac{3I_{o}}{32}

\frac{I_{o}}{I}=\frac{32}{3}=10.67

 


Option 1)

5.33

Option 2)

16.00

Option 3)

10.67

Option 4)

1.80

Preparation Products

Knockout JEE Main April 2021 (One Month)

Personalized AI Tutor and Adaptive Time Table, Self Study Material, Weekend Live Classes, Mentorship from our Experts, Unlimited Mock Tests and Personalized Analysis Reports, 24x7 Doubt Chat Support,.

₹ 14000/- ₹ 4999/-
Buy Now
Knockout JEE Main May 2021

Personalized AI Tutor and Adaptive Time Table, Self Study Material, Weekend Live Classes, Mentorship from our Experts, Unlimited Mock Tests and Personalized Analysis Reports, 24x7 Doubt Chat Support,.

₹ 22999/- ₹ 9999/-
Buy Now
Test Series JEE Main May 2021

Unlimited Chapter Wise Tests, Unlimited Subject Wise Tests, Unlimited Full Mock Tests, Get Personalized Performance Analysis Report,.

₹ 6999/- ₹ 2999/-
Buy Now
Knockout JEE Main May 2022

Personalized AI Tutor and Adaptive Time Table, Self Study Material, Weekend Live Classes, Mentorship from our Experts, Unlimited Mock Tests and Personalized Analysis Reports, 24x7 Doubt Chat Support,.

₹ 34999/- ₹ 14999/-
Buy Now
JEE Main Rank Booster 2021

Booster and Kadha Video Lectures, Unlimited Full Mock Test, Adaptive Time Table, 24x7 Doubt Chat Support,.

₹ 13999/- ₹ 6999/-
Buy Now
Boost your Preparation for JEE Main 2021 with Personlized Coaching
 
Exams
Articles
Questions