Question

An unpolarised beam of intensity 2a² passes through a thin polaroid. Assuming zero absorption in the polaroid, the intensity of emergent plane polarised light will be

Options

• 2a²

• a²

• `sqrt2"a"^2`

• `"a"^2/sqrt2`

Answer 1

a²

Explanation:

The polariser transmits light with half the intensity of unpolarised light.