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Physics - Wave Optics Question with Solution | TestHub

PhysicsWave OpticsPolarizationMedium2 minQB

PhysicsMediumnumerical range

Two polarising plates have polarising directions parallel so as to transmit maximum intensity of light. If to drop the intensity of transmitted beam by one - third the angle by which either plate be turned is $cos^{- 1} (x)$ then x will be :

Answer:

0.57

Solution:

Malus' law: $I = I_{0} cos^{2} θ$

Intensity drops to one-third: $cos^{2} θ = \frac{1}{3}$

$x = cos θ = \frac{1}{3} = 0.577 \approx 0.58$

Stream:JEESubject:PhysicsTopic:Wave OpticsSubtopic:Polarization

⏱ 2mℹ️ Source: QB

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