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Phenomenon of diffraction occurs...

Phenomenon of diffraction occurs

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When light passes through a small opening or by the edge of an Obstacle and falls on a screen, the principle of rectilinear propagation of light from geometrical optics predicts a sharply defined shadow.
However, some of the light deviates from its rectilinear path and penetrates into the region of the geometrical shadow. This is a generel characteristic of wave phenomena and occurs whenever a portion of the wavefront is obstructed in some way. This bending of light waves at an edge into the region of the geometrical shadow is called diffraction of light.
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State the condition under which the phenomenon of diffraction of light takes place. Derive an expression for the width of the central maximum due to diffraction of light at a single slit. A slit of width 'a' is illuminated by a monochromatic light of wavelength 700 nm at normal incidence. Calculate the value of 'a' for position of (i) first minimum at an angle of diffraction of 30. (ii) first maximum at an angle of diffraction 30.

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Knowledge Check

  • Who first discovered the phenomenon of diffraction

    A
    Fresnel
    B
    Fraunhofer
    C
    Arago
    D
    Grimaldi

  • Which of the given statement is/are correct for phenomenon of diffraction? I.For diffraction through a single slit the wavelength of wave must be comparable to the size of the slit II.The diffraction is very common in sound waves but not so common in light waves III.Diffraction is only observed in electromagnetic waves

    A
    onlyI
    B
    II and III
    C
    I and II
    D
    all of the above

  • The phenomenon of diffraction of light was discovered by-

    A
    Huygens
    B
    Newton
    C
    Fresnel
    D
    grimaldi

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    Assertion : The sun lookes bigger in size at sunrise and sunset than during day. Reason : The phenomenon of diffraction bends light rays.

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