Question 415: Waves Optics

Question

Two polaroids P1 and P2 are placed with their axis perpendicular to each other. Unpolarised light $$I$$0 is incident on P1. A third polaroid P3 is kept in between P1 and P2 such that its axis makes an angle 45o with that of P1. The intensity of transmitted light through P2 is

Accepted Answer

Apply Malus' Law,
Intensity of light from first polaroid P
1
, I
1
= $${{{I_0}} \over 2}$$
Intensity of light from second polaroid P
3
,
I
2
= $${{{I_0}} \over 2}{\cos ^2}45^\circ $$ = $${{{I_0}} \over 2} 	imes {1 \over 2}$$
Intensity of transmitted light through P
2
,
I
3
= $${{{I_0}} \over 4}{\cos ^2}45^\circ $$ = $${{{I_0}} \over 4} 	imes {1 \over 2}$$ = $${{{I_0}} \over 8}$$

Answer

$${{{I_0}} \over 4}$$

Answer

$${{{I_0}} \over 8}$$

Answer

$${{{I_0}} \over 16}$$

Answer

$${{{I_0}} \over 2}$$

Waves Optics

Two polaroids P1 and P2 are placed with their axis perpendicular to each other. Unpolarised light $I$0 is incident on P1. A third polaroid P3 is kept in between P1 and P2 such that its axis makes an angle 45o with that of P1. The intensity of transmitted light through P2 is

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