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Malus law- Formula, Definition, Equation

About Malus Law 

Are you searching about best definition about Malus law here i am sharing with you all details related to Malus law which will be sufficient for you to understand how do you use Malus law. This topic is related to polarization of light .
Plane polarized light is obtained by passing unpublished light through a polarizer. When the plane polarized light from the polarizer is passed through the analyzer, the intensity of the polarized light transmitted through the analyzer varies as the square of the angle between the analyzer's plane of transmission and the plane of the polar. This is known as Malas law .

Malus law- Formula, Definition, Equation
Malus law

Short definition for Malus Law

The intensity of plane polarized light passing through an analyte varies according to the square of the cosine of the angle between the plane of the polar and the analyzer's transmission axes.This is known as Malus law

Explain Malus Law in details 

The Malus law can be proved by considering the amplitude (A) of polarized light on the surface of the analyte plane as shown in the given figure. Explain that the angle between the planes of the analyzer and the polarizer .

Th e incident plane is a cos θ parallel to the plane of transmission of the polarized light analyzer and is a sin perpendicular to n.Only the parallel component passes through the analyzer. Light is the intensity of light transmitted through the analyzer

Malus law diagram
Malus law diagram

Malus law equation

I = (a cos θ)2 = a2 cos2 θ -------  ( 1 )

If I0 = a2 is the intensity of plane polarized light on the surface of the analyser then Equation ( 1 )

I = I0 cos2θ --- ( 2 )

When θ = 0, I = I0 and if θ = 90° then I = 0. This result  proved for tourmaline crystals, Nicol prisms, etc.

 Related topic you may like 
Diffraction | Types | Difference Between Fresnel and Fraunhofer

Malus law example

By Malus, when fully polarized light of any plane is incident on the analyte, the intensity of light transmitted by  analyzer ans is directly proportional to  square of the cosine of the angle between the transmission axis and polar of the analyte.


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