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Wave Optics Test - 61
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Wave Optics Test - 61
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  • Question 1/10
    4 / -1
    An astronaut floating freely in space decide to use his flash light as a rocket. He shines a 10 watt light beam in a fixed direction so that he acquires momentum in the opposite direction. If his mass is 80 kg, how long must be need to reach a velocity of 1 ms–1
    Solutions

  • Question 2/10
    4 / -1
    A beam of light consisting of two wavelengths 650 nm and 520 nm is used to illuminate the slit of a Young\'s double slit experiment. Then the order of the bright fringe of the longer wavelength that coincide with a bright fringe of the shorter wavelength at the least distance from the cetnral maximum is
    Solutions

  • Question 3/10
    4 / -1
    Two identical radiators have a separation of d = λ/4 where λ is the wavelength of te waves emitted by either source. The initial phase difference between the source is π/4. Then the intensity on the screen at a distant point situated at an angle θ = 30° from the radiators is (here I0 is intensity at that due to one radiator alone)
    Solutions

  • Question 4/10
    4 / -1
    In Young\'s double slit experiment, the 8th maximum with wavelength λ1 is at a distance d1 from the central maximum and the 6th maximum with a wavelength λ2 is at a distance d2. Then (d1/ λ2) is equal to
    Solutions

  • Question 5/10
    4 / -1
    Light of wavelength 500 nm is used to form interference pattern in Young\'s double slit experiment. A uniform glass plate of refractive index 1.5 and thickness 0.1 mm is introduced in the path of one of the interfering beams. The number of fringes which will shift the cross wire due to this is
    Solutions

  • Question 6/10
    4 / -1
    The two coherent sources of equal intensity produce maximum intensity of 100 unit at a point. If the intensity of one of the sources a is reduced by 36% by reducing its width then the intensity of light at the same point will be
    Solutions

  • Question 7/10
    4 / -1
    The figure shows four pairs of polarising sheets, seen face-on. Each pair is mounted in the path of initially unpolarized light. The polarizing direction of each sheet (indicated by the dashed line) is referenced to either a horizontal x-axis or a vertical y axis. Rank the pair according to the fraction of the initial intensity that they pass, greatest first.

    Solutions

  • Question 8/10
    4 / -1
    In a Young\'s double slit experiment, I0 is the intensity at the central maximum and β is the fringe width. The intensity at a point P distant x from the centre will be
    Solutions

  • Question 9/10
    4 / -1
    In a Fresnel\'s diffraction arrangement, the screen is at a distance of 2 metre from a circular aperture. It is found that for light of wavelengths λ1 and λ2 the radius of 4th zone for λ1 coincides with the radius of 5th zone for λ2. Then the ratio λ1 : λ2 is
    Solutions

  • Question 10/10
    4 / -1
    If n represents the order of a half period zone, the area of this zone is approximately proportional to nm where m is equal to
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