Q401
Open questionThe optical phenomenon that is responsible for the propagation of light signal through an optical fibre is
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Q402
Open questionFor the myopic eye, the defect is cured by
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Q403
Open questionLight enters the eye through a thin membrane called
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Q404
Open questionA concave lens always forms
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Q405
Open questionChoose the correct statement.
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Q406
Open questionWhich of the following lens is used to minimize Myopia?
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Q407
Open questionThe deviation angle is the lowest.
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Q408
Open questionConsider the following statements.
1. Light of longer wavelength is scattered much more than the light of shorter wavelength.
2. The speed of visible light in water is 0.95 times the speed in vacuum.
3. Radio waves are produced by rapidly oscillating electrical currents.
4. To detect the overspeeding vehicles, police use the Doppler effect of reflected short radio waves.
Which of these statements are correct?
1. Light of longer wavelength is scattered much more than the light of shorter wavelength.
2. The speed of visible light in water is 0.95 times the speed in vacuum.
3. Radio waves are produced by rapidly oscillating electrical currents.
4. To detect the overspeeding vehicles, police use the Doppler effect of reflected short radio waves.
Which of these statements are correct?
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Q409
Open questionThe focal length of the lens of a normal human eye is about
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Q410
Open questionThe materials through which objects can be seen but not clearly are called . . . . . . . . materials
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Q411
Open questionDanger signals are generally red as light
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Q412
Open questionAn air bubble inside water behaves as a
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Q413
Open questionTotal internal reflection can take place when light travels from
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Q414
Open questionWhich of these devices uses only convex lenses?
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Q415
Open questionA cut diamond shines brilliantly due to
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Q416
Open questionTotal internal reflection cannot take place when light goes from
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Q417
Open questionSky is blue because
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Q418
Open questionHow is the refractive index of a substance related to the speed of light in air?
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Q419
Open questionWhen a ray of light enters a glass slab, then
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Q420
Open questionReading glasses are made from which type of lenses?
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