In Young's experiment, the wavelength of red light is 7.8 × 10 - 8 c m and that of blue light is 5.2 × 10 - 8 c m . Value of n for which ( n + 1 ) th blue bright fringe coincides with n th red fringe is

Question

In Young's experiment, the wavelength of red light is 7.8 × 10 - 8 c m and that of blue light is 5.2 × 10 - 8 c m . Value of n for which ( n + 1 ) th blue bright fringe coincides with n th red fringe is, 1, 2, 3, 4

MARKS App · Accepted Answer

As we know that n 1 λ 1 = n 2 λ 2 ∴ n 2 n 1 = λ 1 λ 2 = 7.8 × 10 - 8 5.2 × 10 - 8 = 3 2 Also n 2 - n 1 = 1 ∴ n 1 = 2

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