Plane polarised light is passed through an analyser and the intensity of emerging light is reduced by 75 % . Optical vibrations make an angle with the axis of analyser, then is

Step-by-step solution

Let I₀ be the intensity of light incident on polariser. On passing through polariser, it gets reduced to I₀ 2 . So, according to law of Malus, I= I₀ 2 ² Given, I= 75 100 I₀ 2 = 3 I₀ 8 3 I₀ 8 = I₀ 2 ² = 3 2 =30^