# Conceptual Question about Polarisation and Intensity/

1. Apr 18, 2016

### JohnGaltis

1. The problem statement, all variables and given/known data
Consider a beam of unpolarised light incident onto air from a crown-glass with a refractive index of 1.52.

Given that the incident light intensity has a power of 10mW, find the minimum incident angle when the power of the refracted light becomes zero.

2. Relevant equations
I have no idea what equations can be used to solve this.

3. The attempt at a solution
From what I understand, the unpolarised light can lead to a reflected polarised beam and a refracted beam- this happens if the angle of incident is Brewster's Angle.

I am guessing the power of the refracted light is zero if the reflected light is fully polarised?

2. Apr 18, 2016

### JohnGaltis

This is the second part of the question. First part asked for Brewster's Angle and the polarisation state(56.7degrees and Linear Polarisation)

3. Apr 21, 2016

### Summerry

Hey John, you mind to show the steps done?

Update: It's alright I figured it out. :)

Last edited: Apr 21, 2016