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Raju Luthra
Asked: 2022-11-10T08:54:16+05:30 In:

A parallel beam of monochromatic light of wavelength `5000Å` is incident normally on a single narrow slit of width `0.001mm`. The light is focused by a convex lens on a screen placed on the focal plane. The first minimum will be formed for the angle of diffraction equal to
A. (a) `0^@`
B. (b) `15^@`
C. (c) `30^@`
D. (d) `60^@`

A parallel beam of monochromatic light of wavelength `5000Å` is incident normally on a single narrow slit of width `0.001mm`. The light is focused by a convex lens on a screen placed on the focal plane. The first minimum will be formed for the angle of diffraction equal to
A. (a) `0^@`
B. (b) `15^@`
C. (c) `30^@`
D. (d) `60^@`
Parabola
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  1. Correct Answer – C
    For the first minima `dsin theta=lambda`
    `impliessin theta=lambda/dimpliestheta=sin^-1((5000xx10^(-10))/(0.001xx10^-3))=30^@`

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Abdul Sharaf
Asked: 2022-11-08T23:19:50+05:30 In:

A parallel beam of monochromatic light of wavelength `5000Å` is incident normally on a single narrow slit of width `0.001mm`. The light is focused by a convex lens on a screen placed on the focal plane. The first minimum will be formed for the angle of diffraction equal to
A. `0^(@)`
B. `15^(@)`
C. `30^(@)`
D. `60^(@)`

A parallel beam of monochromatic light of wavelength `5000Å` is incident normally on a single narrow slit of width `0.001mm`. The light is focused by a convex lens on a screen placed on the focal plane. The first minimum will be formed for the angle of diffraction equal to
A. `0^(@)`
B. `15^(@)`
C. `30^(@)`
D. `60^(@)`
Parabola
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Leave an answer

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1 Answer

  1. Correct Answer – C
    In single narrow slit, for first minima,
    `d sin theta=lambda rArr sin theta=lambda/d`
    `theta=sin^(-1)((5000xx10^(-10))/(0.001xx10^(-3)))=30^(@)`

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