VITEEE 2015 Paper

Let the intensity of unpolarised light be I0 , so the intensity of first polaroid is

I0

2

. On rotating through 60°, the intensity of light from second polaroid
I = (

I0

2

) (cos60)2 =

I0

2

1

4

=

I0

8

= 0.125 I0
∴ percentage of incident light transmitted through the system = 12.5%.