A polaroid is being used as an analyzer of plane polaroid light. In one complete rotation of the crystal, the maximum intensities will be observed only

Question

A polaroid is being used as an analyzer of plane polaroid light. In one complete rotation of the crystal, the maximum intensities will be observed only (A) once (B) twice (C) thrice (D) data is inadequate

Tardigrade Admin · Accepted Answer

I=I0 cos 2 θ If I=I0 ⇒ cos 2 θ=1 or cos θ=± 1 ⇒ θ=0°, 180° Hence maximum intensity is observed twice.

Q. A polaroid is being used as an analyzer of plane polaroid light. In one complete rotation of the crystal, the maximum intensities will be observed only

once

twice

thrice

data is inadequate

$I = I_{0} cos^{2} θ$
If $I = I_{0} \Rightarrow cos^{2} θ = 1$
or $cos θ = \pm 1 \Rightarrow θ = 0^{\circ}, 18 0^{\circ}$
Hence maximum intensity is observed twice.

Q. A polaroid is being used as an analyzer of plane polaroid light. In one complete rotation of the crystal, the maximum intensities will be observed only

once

twice

thrice

data is inadequate

I=I0​cos2θ If I=I0​⇒cos2θ=1 or cosθ=±1⇒θ=0∘,180∘ Hence maximum intensity is observed twice.

$I = I_{0} cos^{2} θ$
If $I = I_{0} \Rightarrow cos^{2} θ = 1$
or $cos θ = \pm 1 \Rightarrow θ = 0^{\circ}, 18 0^{\circ}$
Hence maximum intensity is observed twice.