Answer:
option (B)
Explanation:
Intensity of unpolarised light, I = 25 W/m^2
When it passes from first polarisr, the intensity of light becomes
[tex]I'=\frac{I_{0}}{2}=\frac{25}{2}=12.5 W/m^{2}[/tex]
Let the intensity of light as it passes from second polariser is I''.
According to the law of Malus
[tex]I'' = I' Cos^{2}\theta[/tex]
Where, θ be the angle between the axis first polariser and the second polariser.
[tex]I'' = 12.5\times Cos^{2}15[/tex]
I'' = 11.66 W/m^2
I'' = 11.7 W/m^2
