Solved Examples on Brewster Law
Example: Determine the angle of refraction and polarization angle of the polarizer if the refractive index of the polarizer is 1.73.
Solution:
Given, Refractive index of the polarizer = 1.73
According to Brewster’s law, μ = tan θB = n2/n1
θB = tan-1μ
θB = tan-1(1.73) = tan-1 (√3)
θB = 600 (angle of polarisation)
Since, ip + rp = 900
600 + rp = 900 (As θB and ip are same)
rp = 900– ip
rp = 900-600
rp = 300 ( angle of refraction)
Brewster’s Law – Definition, Formula, Derivation, Example, Uses
Brewster’s Law states that when unpolarized light strikes a surface at a specific angle (Brewster angle), the reflected light becomes polarized perpendicular to the plane of incidence. According to Brewster Law of polarization, the refractive index of a medium is equal to the tangent of the polarizing angle. This law finds applications in making polarizing filters for reducing glare in sunglasses and improving image quality in cameras, LCD screens, and optical devices by selectively transmitting polarized light.
In this article we will learn in detail about Brewster Law of Polarization, its formula, derivation, relationship with snell’s law and its application. We will also learn about Brewster angle and its relationship with critical angle in this article.
Table of Content
- What is Brewster’s Law
- Brewster’s Law Formula
- Brewster’s Angle in Physics
- Brewster’s Law Experiment
- Applications of Brewster’s Law
- Solved Examples on Brewster Law