Ahorizontal beam of light of intensity 25 w/m2 is sent through two polarizing sheets. the polarizing direction of the first makes a 15° angle with that of the second. suppose that the initial beam is unpolarized. what then is the intensity of the transmitted light? a. 7.2 w/m2 b. 11.7 w/m2 c. 12.1 w/m2 d. 23.3 w/m e. 24.1 w/m

option (B)

Explanation:

Intensity of unpolarised light, I = 25 W/m^2

When it passes from first polarisr, the intensity of light becomes

Let the intensity of light as it passes from second polariser is I''.

According to the law of Malus

Where, θ be the angle between the axis first polariser and the second polariser.

I'' = 11.66 W/m^2

I'' = 11.7 W/m^2

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explanation:

distance = 150m

displ = root (50 ^2 + 100^2)

root(2500+10000)

root 125000