According to Malus Law, we have I=I0cos2θ where, I is intensity of emergent polarised light; I0 is intensity of incident polarised light; θ is angle between pass axis of both polarisers Here θ=60° Therefore I=I0(cos‌60)2=I0(‌
1
2
)2=‌
I0
4
Thus, intensity of emergent polarised light from second polarizer =