The ratio of the speed of light in a medium to a vacuum is called . . . . . . . . .
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When a person walking in bright sunlight enters a dark room, he is not able to see clearly for a little while because the
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Which one of the colours has the longest wavelength?
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The speed of light with the rise in the temperature of the medium
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An air bubble in water will act like a
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Consider the following statements.
1. The minimum size of a mirror required to see the full image of a person is half the height of the person.
2. A convex mirror always forms a virtual, erect and diminished image.
3. The laws of reflection are true for all reflecting surfaces.
4. The focal length of a plane mirror is zero.
Which of the statement(s) given above is/are correct?
1. The minimum size of a mirror required to see the full image of a person is half the height of the person.
2. A convex mirror always forms a virtual, erect and diminished image.
3. The laws of reflection are true for all reflecting surfaces.
4. The focal length of a plane mirror is zero.
Which of the statement(s) given above is/are correct?
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In which of the following mirror size of image formed is always equal to the size of object?
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Polaraids are used
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Which of the following does not have an optical lens?
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Which of the following is located on the polished surface of the mirror?
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The number of images of an object placed between two parallel mirrors is
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Daltonism (Protanopia) is the form of colour blindness in which the patient cannot see
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A ray of light goes from water to glass. Its-
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Assertion (A): In the visible spectrum of light, red light is more energetic than green light.
Reason (R): The wavelength of red light is more than that of green light.
Reason (R): The wavelength of red light is more than that of green light.
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A periscope works on the principle of
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The lens-type commonly used for correcting presbyopia is . . . . . . . .
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What will be the focal length of a spherical mirror with radius of curvature R?
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Why does a piece of cloth, which appears green in sunlight, appear black when it is viewed under red light?
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Dentists use a concave mirror because the image built on it is . . . . . . . .
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Diffusion of light in the atmosphere takes place due to
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