Question 410: Wave Optics

Question

Two polaroids P
1
and P
2
are placed with their axis perpendicular to each other. Unpolarised light $$I$$
0
is incident on P
1
. A third polaroid P
3
is kept in between P
1
and P
2
such that its axis makes an angle 45
o
with that of P
1
. The intensity of transmitted light through P
2
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

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

Wave Optics

Two polaroids P 1 and P 2 are placed with their axis perpendicular to each other. Unpolarised light $I$ 0 is incident on P 1 . A third polaroid P 3 is kept in between P 1 and P 2 such that its axis makes an angle 45 o with that of P 1 . The intensity of transmitted light through P 2 is

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