Please answer question no 13

Q. 13.   State clearly how an unpolarised light linearly polarised, when passed through a polaroid .

(i)  Unpolarised light of intensity I₀ is incident on a polaroid P₁ which is kept near polaroid P₂ whose pass axis is parallel to that of P₁. How will the intensities of light, I₁ and I₂, transmitted by the polaroids P₁ and P₂ respectively, change on rotating P₁ without disturbing P₂ ?

(ii)  Write the relation between the intensities I₁ and I₂ .

Dear Student
Kindly find the answer of your  asked query.

when unpolarised light passes  through the polarizer then only those virations of the electric field  passes through the polarizer which are parallel to the axis  of the polarizer. And the restriction of  the vibration of the electric field in one particular dirrection is know as the polarization of the light hence light becomes polarized.
$$\begin{gathered} When unpolarized light incident on the polarizer then, intensity of light is given bby: \\ {I}_1=\frac{I_0}{2} \\ intensity of light after pas\sin g through the polarizer is given by \\ {I}_2=I_1{\cos }^2\theta \\ where \theta is the angle betwee the two polarizers. \\ when they are parallel then I_2=I_1 \\ and intensity decreases when angle between themm increases and finally becomes zero when angle between them is 90 degree. \end{gathered}$$



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