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Kirti Owais Mangal
Asked: 2022-11-06T11:52:04+05:30 In:

A narrow slit of width 2 mm is illuminated by monochromatic light fo wavelength 500nm. The distance between the first minima on either side on a screen at a distance of 1 m is
A. 5 mm
B. 0.5 mm
C. 1 mm
D. 10 mm

A narrow slit of width 2 mm is illuminated by monochromatic light fo wavelength 500nm. The distance between the first minima on either side on a screen at a distance of 1 m is
A. 5 mm
B. 0.5 mm
C. 1 mm
D. 10 mm
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1 Answer

  1. Correct Answer – B
    Here, `a=2mm = 2xx10^(-3)m`
    `lambda=500 nm=500 xx 10^(-9)m=5xx10^(-7)m, D=1m`
    The distance between the first minima on either side on
    a screen `=(2lambda D)/(a)=(2xx5xx10^(-7)xx1)/(2xx10^(-3))`
    ` ” ” =5xx10^(-4)m=0.5xx10^(-3)m=0.5mm`

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