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In Young's double slit experiment, if the source of light changes from orange to blue, then
Asked in JEE Main 27th July 1st Shift 2021 · Fringe width and fringe position
- (1) the central bright fringe will become a dark fringe
- (2) the distance between consecutive fringes will decrease
- (3) the distance between consecutive fringes will increase
- (4) the intensity of the minima will increase.
Answer: (2) the distance between consecutive fringes will decrease
Step-by-step solution
λ_blue < λ_orange
β = (λ D)/d decreases, so fringes come closer.
Why the other options are wrong
- (1) The central point always has zero path difference, so it stays bright.
- (3) Thinks blue has the longer wavelength.
- (4) Colour change does not alter the amplitudes, so minima stay dark.
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