In which of the given cases do we get very strong reflected rays and very weak refracted rays ?
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The focal length of a concave mirror is 50 cm. To obtain an inverted image two times the size of the object the object should be placed at
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The focal length of the object of microscope is
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In order to increase the magnifying power of a microscope
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A convex lens of power P is immersed in a water. How will its power change ?
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Using a convex lens, a clear image of candle flame is produced on a screen. How many other clear images can be received on this screen if only the lens is to be shifted ?
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A parallel beam of light is incident on a converging lens parallel to its principal axis. As we move away from the lens on the other side on its principal axis the intensity of light
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The focal length of lens depends on
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What is the minimum distance between an object and its virtual image in case of a concave lens ?
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Two lenses of power +3 and -1 diopters are placed in contact. The focal length of the combined lens is
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Which of the given is not true of an image formed by a plane mirror?
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Critical angle of light passing from glass to air is minimum for
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