Unpolarized light of intensity passes successively through three ideal polarizers

PHYSICS · Single correct · CBSE · Physics · Wave Optics · Wave Optics

Problem

Unpolarized light of intensity 80 W/m280\,\text{W/m}^2 passes successively through three ideal polarizers. The first polarizer’s axis is vertical (0°), the second is oriented at 30° to vertical, and the third is oriented at 90° to vertical. What is the final transmitted intensity? (a) 15 W/m215\,\text{W/m}^2 (b) 7.5 W/m27.5\,\text{W/m}^2 (c) 0 W/m20\,\text{W/m}^2 (d) 17 W/m217\,\text{W/m}^2

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