Question 433: Wave Optics

Question

Unpolarised light falls on two polarising sheets placed one on top of other. If the intensity of transmitted light is one fourth of the incident light, the angle between them is

Accepted Answer

From law of Malus
$$I=I_0 \cos ^2 	heta$$
Given,
$$\begin{aligned}
& I=\frac{I_0}{4} \
& \frac{1}{4}=\cos ^2 	heta
\end{aligned}$$
$$\Rightarrow \quad \cos 	heta=\frac{1}{2} \Rightarrow 	heta=60^{\circ}$$
Note None of the options are correct.

Answer

$$35^{\circ}$$

Answer

$$40^{\circ}$$

Answer

$$45^{\circ}$$

Answer

$$50^{\circ}$$

Wave Optics

Unpolarised light falls on two polarising sheets placed one on top of other. If the intensity of transmitted light is one fourth of the incident light, the angle between them is

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