Question

At what angle should the axes of two polaroids be placed so as to reduce the intensity of the incident unpolarized light to 13.

Answer 1

θ = 66.90°

Step-by-step explanation:

we know that

`I= (I_0)/(2)cos^2\theta`

I= intensity of polarized light =1

I_o= intensity of unpolarized light = 13

putting vales we get

`1= (13)/(2)cos^2\theta`

⇒
`\theta=cos^(-1) \sqrt{(1)/(6.5) }`

therefore θ = 66.90°