By Huygen's wave theory of light, we cannot explain the phenomenon of:
1. | Interference |
2. | Diffraction |
3. | Photoelectric effect |
4. | Polarisation |
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Soap bubble appears coloured due to the phenomenon of:
1. Interference
2. Diffraction
3. Dispersion
4. Reflection
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Which of the following statements indicates that light waves are transverse?
1. | Light waves can travel in a vacuum. |
2. | Light waves show interference. |
3. | Light waves can be polarized. |
4. | Light waves can be diffracted. |
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If an interference pattern has maximum and minimum intensities in a 36 : 1 ratio, then what will be the ratio of their amplitudes?
1. 5 : 7
2. 7 : 4
3. 4 : 7
4. 7 : 5
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In Young's experiment, light of wavelength 4000 Å is used to produce bright fringes of width 0.6 mm, at a distance of 2 meters. If the whole apparatus is dipped in a liquid of refractive index 1.5, then fringe width will be:
1. 0.2 mm
2. 0.3 mm
3. 0.4 mm
4. 1.2 mm
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In two separate set-ups of the Young's double slit experiment, fringes of equal width are observed when lights of wavelengths in the ratio 1 : 2 are used. If the ratio of the slit separation in the two cases is 2 : 1, the ratio of the distances between the plane of the slits and the screen in the two set-ups is:
1. 4 : 1
2. 1 : 1
3. 1 : 4
4. 2 : 1
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The slits in Young's double-slit experiment have equal widths and the source is placed symmetrically relative to the slits. The intensity at the central fringe is I0. If one of the slits is closed, the intensity at this point will be:
1. I0
2. I0 / 4
3. I0 / 2
4. 4I0
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In Young's double slit experiment, the angular width of fringe is 0.20o for sodium light of wavelength 5890 Å. The angular width of fringe, if the complete system is dipped in water, will be:
1. 0.11o
2. 0.15o
3. 0.22o
4. 0.30o
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The direction of the first secondary maximum in the Fraunhofer diffraction pattern at a single slit is given by:
(a is the width of the slit)
1.
2.
3.
4.
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A parallel beam of monochromatic light of wavelength 5000 Å is incident normally on a single narrow slit of width 0.001 mm. 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:
1. 0o
2. 15o
3. 30o
4. 60o
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