It is just a conceptual doubt
According to malus law intensity of light through polaroid is
I=(Io)cos^2(theta) where theta is the angle between axis of polaroid and incident light.
The Attempt at a Solution
But when Theta=0 then I=Io but in my book it is I=Io/2.
and also is my diagram below correct?
--->(light)(I) (polaroid) --->(I/2)  --->(I/4) (theta=0 degrees for both polaroid)