Young's double slit experiment is carried out using microwaves of wavelength λ=3mm. Distance between the slits is d=5mm and the distance between the plane of slits and the screen is D=100cm. Find the total number of maxima formed on the screen.
A
3
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B
5
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C
1
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D
2
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Solution
The correct option is A3 Given, λ=3mm and d=5mm
We know that, for maxima (bright) Δx=nλ
or Δx=dsinθ=nλ
or, sinθ=nλd=n×35=3n5
Also, we know that sinθ<1⇒3n5<1⇒n<53
Since, n can have only integral value, so, n=0,±1
Hence, no. of maxima is 3