Answer :

(i) According to malus, when completely plane polarized light is incident on the analyzer, the intensity I of the light transmitted by the analyzer is directly proportional to the square of the cosine of the angle between the transmission axes of the analyzer and the polarizer. This is known as the Malus law.

i.e. I0 α cos2 θ or

I = I0 cos2 θ


I0 is the intensity of the light incident on the analyzer and

θ is the angle between the analyzer and the polarizer.

This can be more accurately described as,

(ii) the variation of intensity (I) of polarised light transmitted by an analyser with an angle (θ) between polariser and analyser is given as:

(iii) The relation between the refractive index of the medium and the polarizing angle can be written as:

μ = tan ϕ


μ is the refractive index

ϕ is the polarizing angle


Polarizing angle, ϕ = 60°

μ = tan 60°

μ = (3)1/2 = 1.732

The value of refractive index of a medium is 1.732

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
view all courses

Sketch the graphsPhysics - Board Papers

Define the term wPhysics - Board Papers

(i) State law of Physics - Board Papers

When unpolarised Physics - Board Papers

When a potential Physics - Board Papers

<span lang="EN-USPhysics - Exemplar

<span lang="EN-USPhysics - Exemplar