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Wave Optics Test - 24
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Wave Optics Test - 24
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  • Question 1/10
    4 / -1
    In Young’s double slit experiment, the wavelength of light was changed from 7000 Å to 3500 Å. While doubling the separation between the slits,which of the following is not true for this expt.?
    Solutions

  • Question 2/10
    4 / -1
    To demonstrate the phenomenon of interference, we require two sources, which emit radiations
  • Question 3/10
    4 / -1
    Interference fringes are produced in Young’s double slit experiment using light of wavelength 5000 Å .when a film of material 2.5 × 10-3 m thick was placed over one of the slits, the fringe pattern shifted by a distance equal to 20 fringe widths. The refractive index of the material of the film is
    Solutions

  • Question 4/10
    4 / -1
    If two coherent sources are placed at a distance 3 λ from each other, symmetric to the centre of the circle shown in fig (R>>λ), then number of bright fringes shown on the screen placed along the circumference is

    Solutions

  • Question 5/10
    4 / -1
    White light is used to illuminate the two slits in a young’s double slit expt. The separation between slits is b and the screen is at a distance d (>>b) from the slits. At a point on the screen directly in front of one of the slits, certain wavelengths are missing, fig. Some of these missing wavelengths are

    Solutions

  • Question 6/10
    4 / -1
    The two coherent sources with intensity ratio β produce interference. The fringe visibility will be
    Solutions

  • Question 7/10
    4 / -1
    In a biprism expt, 5th dark fringe is obtained at a point. If a thin transparent film is placed in the path of one of waves, then 7th bright fringe is obtained at the same point. The thickness of the film in terms of wavelength λ and refractive index μ will be
    Solutions

  • Question 8/10
    4 / -1
    A monochromatic beam of light falls on young’s double slit expt. Apparatus at some (say θ) as shown in fig . A thin sheet of glass is inserted infront of the lower slit S2. The central bright fringe (path difference= 0) will be obtained

  • Question 9/10
    4 / -1
    Light of wavelength λ is incident on a slit of width d. The resulting diffraction pattern is observed on a screen at a distance D. The linear width of the principal maximum is equal to the width of the slit, if D equals
    Solutions

  • Question 10/10
    4 / -1
    A plate of thickness t made of a material of refractive index μ is placed in front of one of the slits in a double slit experiment. What should be the minimum thickness t, which will make the intensity at the centre of the fringe pattern zero?
    Solutions

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