Verified Solution • 2025–26 Session moderate

QNEET-2017-Ph-985: NEET 2017 Physics - Class 12 NEET-2017-Ph-985 Solution: Two polaroids \(P_1\) and \(P_2\) are placed with their axis…

Two polaroids P1P_1 and P2P_2 are placed with their axis perpendicular to each other. Unpolarised light I0I_0 is incident on P1P_1. A third polaroid P3P_3 is kept in between P1P_1 and P2P_2 such that its axis makes an angle 45∘45^\circ with that of P1P_1. The intensity of transmitted light through P2P_2 is I04\frac{I_0}{4} I08\frac{I_0}{8} I016\frac{I_0}{16} I02\frac{I_0}{2}

Multiple Choice Options

  • A I04{{{I_0}} \over 4} 4 I 0 _ _
  • B I08{{{I_0}} \over 8} 8 I 0 _ _
  • C I016{{{I_0}} \over 16} 16 I 0 _ _
  • D I02{{{I_0}} \over 2} 2 I 0 _ _

Step-by-Step Verified Solution

Apply Malus' Law, Intensity of light from first polaroid P 1 , I 1 = I 0 2 Intensity of light from second polaroid P 3 , I 2 = I 0 2 cos 2 45 _ = I 0 2 _ 1 2 Intensity of transmitted light through P 2 , I 3 = I 0 4 cos 2 45 _ = I 0 4 _ 1 2 = I 0 8

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