Answer:
Explanation:
If I be the intensity of original light , after first polarization , its intensity becomes I/2
After second polarization its intensity becomes I/2 X Cos²θ
where θ is the angle between the two polaroids
So I₁ = I/2 Cos²θ
I₁ / I =.5 X Cos²θ = 0.123
Cos²θ = 0.246
θ = 60 degree. Ans