Chapter: Wave Optics· Physics

In biprism experiment, the distance of 20th bright band from the central bright band is 1.2 cm. Without changing the experimental set-up, the distance of 30th bright band from the central bright band will be _____.

Q.1 (x) In biprism experiment, the distance of 20^th bright band from the central bright band is 1.2 cm. Without changing the experimental set-up, the distance of 30^th bright band from the central bright band will be _____.

A. 0.6 cm

B. 0.8 cm

C. 1.2 cm

D. 1.8 cm

Doubtly Asked 29 Oct 2026 Board exam · March 2024 hsc 12th Save WhatsApp Report

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Answer: D. 1.8 cm

Answer: (d) 1.8 cm

The distance of the \(n\)th bright band is \(x_n = \dfrac{n\lambda D}{d}\), so \(x_n \propto n\) for the same set-up.

\(x_{30} = x_{20}\times\dfrac{30}{20} = 1.2\times 1.5 = 1.8\) cm.

Doubtly AI · 29 Oct 2026 AI-generated · not yet verified Report

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In biprism experiment, the distance of 20th bright band from the central bright band is 1.2 cm. Without changing the experimental set-up, the distance of 30th bright band from the central bright band will be _____.

1 answer

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