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Earn 100

Assertion: For best contrast between maxima and minima in the interference pattern of young's double slit experiment, the intensity of light emerging out of the two slits should be equal.

Reason: The intensity of interference pattern is proportional to square of amplitude.

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Important Questions on Wave Optics

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Assertion: In Young's double slit experiment, the fringes become indistinct if one of the slits is covered with partially opaque paper.

Reason: The partially opaque paper decreases the wavelength of light.

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Assertion: The unpolarized light and polarised light can be distinguished from each other by using Polaroid.

Reason: A Polaroid is capable of producing plane polarised beams of light.

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An observer is moving with half the speed of light towards a stationary microwave source emitting waves at frequency 10 GHz. What is the frequency of the microwave measured by the observer? (speed of light=3×108 m s-1)

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In Young’s double slit experiment, the slits are 2 mm apart and are illuminated by photons of two wavelengths λ1=12000  and λ2=10000. At what minimum distance from the common central bright fringe on the screen 2 m from the slit will a bright fringe from one interference pattern coincide with a bright fringe from the other?
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A parallel beam of fast moving electrons is incident normally on a narrow slit. A fluorescent screen is placed at a large distance from the slit. If the speed of the electrons is increased, then which of the following statements is correct?
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In a double-slit experiment, the two slits are 1 mm apart and the screen is placed 1 m away. A monochromatic light of wavelength 500 nm is used. What will be the width of each slit for obtaining ten maxima of double-slit within the central maxima of single-slit pattern?
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For a parallel beam of monochromatic light of wavelength λ', diffraction is produced by a single slit whose width 'a' is of the wavelength of the light. If 'D' is the distance of the screen from the slit, the width of the central maxima will be
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In a diffraction pattern due to a single slit of width e, the first minimum is observed at an angle 30° when light of wavelength 5000 Ao is incident on the slit. The first secondary is observed at an angle of: