In biprism experiment, if 5 th bright band with wavelength λ₁' coincides with 6 th dark band with wavelength λ₂' then the ratio ((λ₂)/(λ₁)) is (a) 9/7 (b) 7/9 (c) 10/11 (d) 11/10

Answer: (c). 5th bright: y = (5λ₁ D)/(d); 6th dark: y = (11λ₂ D)/(2d). Equate: 5λ₁ = 5.5λ₂. (λ₂)/(λ₁) = 10/11. So the answer is (c).

In biprism experiment, if 5 th bright band with wavelength λ₁'… | MHT CET 2023 (11 May, Shift 1)

Q19MHT CET 2023 · 11 MAY · SHIFT 1Medium

Biprism, Thin Films & Other Devices

In biprism experiment, if $5$ th bright band with wavelength $\lambda_1'$ coincides with $6$ th dark band with wavelength $\lambda_2'$ then the ratio $\left(\frac{\lambda_2}{\lambda_1}\right)$ is

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Answer: (c)

5th bright: $y = \frac{5\lambda_1 D}{d}$ ; 6th dark: $y = \frac{11\lambda_2 D}{2d}$ .
Equate: $5\lambda_1 = 5.5\lambda_2$ .
$\frac{\lambda_2}{\lambda_1} = \frac{10}{11}$ . So the answer is (c).

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