Q. 17 an unpolarized light passes through three polarizing sheets whose polarizing directions make an angle of 30, 60 and 30 with y axis in same sense. What fraction of initial intensity is transmitted by the system?
Answers
Answered by
1
Answer:
Explanation: please mark me as brainliest and follow me
Attachments:
Answered by
0
Explanation:
Given an unpolarized light passes through three polarizing sheets whose polarizing directions make an angle of 30, 60 and 30 with y axis in same sense. What fraction of initial intensity is transmitted by the system?
- Using Malus law we have
- There is a polarizer and the light is being polarized. The light is in both direction. The light is being polarized in the middle direction. Let the angle made by the polarizer be theta.
- So the intensity produced after polarizing of light will be
- I α cos^2 theta
- In the first case theta will be 30 degree.
- In unpolarized there will be two directions and total intensity will be Io
- So I = Io cos^2 theta
- So I1 = Io / 2 (cos 30 degree)^2
- = Io / 2 (√3 / 2)^2
- = 3/8 Io
- So I2 = I 1 (cos 60 degree)^2
- = 3/8 Io x (1/2)^2
- = 3 Io / 32
- So I3 = I2 (cos 30 degree)^2
- = 3/32 Io (√3 / 2)^2
- = 3/32 x ¾ Io
- = 9/128 Io
- Initial intensity (9/128)
- So Io was unpolarized light intensity.
- So 9/128 will be the initial intensity transmitted by the system.
Reference link will be
https://brainly.in/question/15735320
Similar questions