The path difference between two identical light waves at a point Q on the screen is 3. If wavelength of the waves is 5000 Å, then at point Q there is (a) 3rd dark band (b) 4th bright band (c) 5th dark band (d) 6 th bright band

Answer: (d). (Δ x)/(λ) = 3×10⁻⁶5×10⁻⁷ = 6 Path difference = 6λ (whole number) gives a bright band of order 6. So the answer is (d) 6th bright band.

The path difference between two identical light waves at a point Q on… | MHT CET 2023 (13 May, Shift 2)

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YDSE: Fringe Width & Fringe Positions

The path difference between two identical light waves at a point $Q$ on the screen is $3\mu\text{m}$ . If wavelength of the waves is $5000\ \text{Å}$ , then at point $Q$ there is

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Answer: (d)

$\frac{\Delta x}{\lambda} = \frac{3\times10^{-6}}{5\times10^{-7}} = 6$
Path difference $= 6\lambda$ (whole number) gives a bright band of order 6.
So the answer is (d) 6th bright band.

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