How many times the intensity of an unpolarized light wave reduces after passing through a polarizer?

Q.1 (viii) How many times the intensity of an unpolarized light wave reduces after passing through a polarizer?

A. \(\dfrac{1}{2}\)

B. \(\dfrac{1}{4}\)

C. \(\dfrac{1}{6}\)

D. \(\dfrac{1}{8}\)

Doubtly Asked 28 Oct 2026 Board exam · July 2025 hsc 12th Save WhatsApp Report

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Answer: A. \(\dfrac{1}{2}\)

Answer: (a) \(\dfrac{1}{2}\)

In unpolarized light the electric vector takes all directions equally. A polarizer passes only the component along its transmission axis; averaging \(\cos^2\theta\) over all angles gives \(\dfrac{1}{2}\), so the transmitted intensity is \(I_0/2\).

Doubtly AI · 28 Oct 2026 AI-verified · Oct 2026 Report

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How many times the intensity of an unpolarized light wave reduces after passing through a polarizer?

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