Calculating Electric Field Amplitude of Transmitted Light

AI Thread Summary
To calculate the electric field amplitude of transmitted light through a polarizing sheet, the initial intensity of unpolarized light is 30 watts/m^2, leading to a polarized intensity of 15 watts/m^2. The relationship between intensity and electric field is given by I = (E^2)/(μ₀c). The discussion highlights the need to relate the electric field amplitudes of the transmitted and incident light, ultimately simplifying the problem using the correct equations. The participants express frustration over the placement of questions in the textbook, indicating a common challenge in finding relevant information. Understanding the relationship between intensity and electric field is crucial for solving the problem effectively.
sheepcountme
Messages
80
Reaction score
1

Homework Statement



A beam of unpolarized light with intensity 30 watts/m^2 passes through a polarizing sheet. What is the electric field amplitude of the transmitted beam?

Homework Equations



Ia=Ipcos2\Theta
Ea=Epcos\Theta
Ip=Io/2

The Attempt at a Solution



I solved the first two equations for cos\Theta and set them equal to each other to get sqrt(Ia/Ip)=Ea/Ep

I know Io is 30, so Ip is 15

So then, I believe I should have sqrt(2)=Ea/Ep and I don't know how to just solve for one without the other...
 
Physics news on Phys.org
you need to know how the intensity of light is related to the electric field intensity. Look after in your textbook.

ehild
 
Ah, okay, so scrap all that and use I=(E2)/muoc

Thanks!

The book apparently likes to put questions at the end of random chapters!
 
Thread 'Collision of a bullet on a rod-string system: query'

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
View full post »
Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

Intensity and electric field amplitude
Replies
7
Views
2K
Electric field amplitude question regarding intensity calculations
Replies
4
Views
1K
Amplitude of an oscillating electric field
Replies
4
Views
3K
I Thought I Understood Gauss' Law (Sheets)
Replies
26
Views
2K
Help with derivation of Malus' Law
Replies
5
Views
2K
Calculating Electric and Magnetic Field amplitude
Replies
23
Views
15K
Electric field at a point problem
Replies
1
Views
2K
Coulomb's law to find electric field for charge density function
Replies
11
Views
1K
What is the amplitude of the electric field (laser reflection)
Replies
1
Views
5K
Polarization of Light: Polarizer
Replies
7
Views
2K

Hot Threads

Recent Insights

Back
Top