Q381
Open question. . . . . . . . is also called a convergence mirror-
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Q382
Open questionA point on the principle axis of lens through which light rays pass undeviated, is called
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Q383
Open questionWhich one of the following statements is not correct?
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Q384
Open questionThe power of a lens is measured in
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Q385
Open questionThe focal length of a concave mirror with radius of curvature of 20 cm will be-
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Q386
Open questionThe lens which is thin in the middle and thick at its periphery is called as?
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Q387
Open questionThe principle due to which circular patches of light is seen under a tree during day time is similar to that of image formation by a
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Q388
Open question. . . . . . . . is used in periscope.
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Q389
Open questionWhich of the following statement(s) is/ are correct for critical angle?
1. Refractive angle is 90°.
2. Light ray goes from rarer to denser medium.
3. Light ray goes from denser to rarer medium.
1. Refractive angle is 90°.
2. Light ray goes from rarer to denser medium.
3. Light ray goes from denser to rarer medium.
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Q390
Open questionThe image for a plane mirror is:
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Q391
Open questionThe magnifying power of an astronomical telescope can be decreased by
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Q392
Open questionA man cannot see clearly beyond 10 m. The disease he suffers from
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Q393
Open questionThe speed of light in a medium whose refractive index 1.5 is . . . . . . . .
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Q394
Open questionA mirage occurs because of
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Q395
Open questionA simple microscope consists of a
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Q396
Open questionWhich of the following can produce a virtual image larger than the object?
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Q397
Open questionThe light energy escaping from the sun can be spread by
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Q398
Open questionObjects that produce their own light, are called-
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Q399
Open questionWhen an object is placed at the center of curvature of a circular concave mirror, what will be the position of image formed by that concave mirror?
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Q400
Open questionWhat is the colour of the light emitted by the Sun?
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