Two crossed polaroids transmit light of intensity:
AI₀ (full intensity)
BZero — because cos²(90°) = 0; no light gets through
CI₀/2
DI₀/4
Answer & Solution
Correct answer: B. Zero — because cos²(90°) = 0; no light gets through
**Crossed polaroids (pass-axes at 90°)**: I_transmitted = I_polarised × cos²(90°) = **0**. Complete extinction. This is the basis of polarimeters and 3D glasses (where each lens passes only one polarisation).
Related questions
Blue sky seen through a rotating polaroid rises and falls in brightness. Sky light is:Two polaroids are set crossed. The light passing through both is:Ordinary lamp light passes through one polaroid. Its intensity drops to:Wiggle a string up and down and a wave runs along it. The displacement is at right angles The rainbow of colours you see on a CD comes from:Diffraction is shown by:Near the edge of a shadow you see alternate dark and bright bands. This is:In Young's pattern, consecutive bright fringes are: