Question

A system of three polarizers P₁, P₂, P₃ is set up such that the pass axis of P₃ is crossed with respect to that of P₁. The pass axis of P₂ is inclined at 60º to the pass axis of P₃. When a beam of unpolarized light of intensity 10 is incident on P₁, the intensity of light transmitted by the three polarizers is I. The ratio (I₀/I) equals (nearly):

(1) 10.67 (2) 5.33 (3) 16.00 (4) 1.80 

Answer 1

Correct option (1) 10.67

Explanation:

When unpolarized light of intensity I₀ passes through P₁, P₂ and P₃, let the emergent light from P₁, P₂ and P₃ and I₁, I₂ & I₃. Then from Malus law

I = I₀cos² θ

I₀ = Incident Intensity 

θ = Angle between pass axes and incident light

Comments

Abe 30° kaha se aagayaa??????