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

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

In biprism experiment, if 5 th bright band with wavelength λ₁… | MHT CET 2024 (10 May, Shift 1)

Q15MHT CET 2024 · 10 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 $(\lambda_1/\lambda_2)$ 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: $5\lambda_1 = 5.5\lambda_2$ .
$\frac{\lambda_1}{\lambda_2} = \frac{11}{10}$ . So the answer is (c).

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