Q

# Solve this problem Two Polaroids P1 and P2 are placed with their axis perpendicular to each other. Unpolarised light I0 is incident on P1. A third polaroid P3 is kept in between P1 and P2 such that its axis makes an angle 45° with that of P1 . Th

Two Polaroids P1 and P2 are placed with their axis perpendicular to each other. Unpolarised light I0 is incident on P1. A third polaroid P3 is kept in between P1 and P2 such that its axis makes an angle 45° with that of P1 . The intensity of transmitted light through P2 is:

• Option 1)

• Option 2)

• Option 3)

• Option 4)

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As we learnt in

Malus Law -

$I= I_{0}\cdot \cos ^{2}\theta$

$\theta =$ angle made by E vector with transmission axis.

- wherein

$I=$ Intensity of transmitted light after polarisation .

$I_{0}=$ Intensity of  incident light.

Intensity of light after crossing $P_1=\frac{I_0}{2}$

Intensity of light after crossing $P_3=\frac{I_0}{2}.cos^245^{\circ}=\frac{I_0}{4}$

Intensity of light after crossing  $P_2=\frac{I_0}{4}.cos^245^{\circ}$

$I=\frac{I_0}{8}$

Option 1)

Incorrect

Option 2)

Incorrect

Option 3)

Correct

Option 4)

Incorrect

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