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When light travels from a rarer to denser medium the speed decreases. does energy also gets reduced?
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A concave mirror of focal length f produces an image n times the size of the object. If the image is real find the image distance.
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A plane and a convex mirrors form virtual images of objects. Can they produce real images under some circumstances? explain.
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If an eye produces too much convergence in the incident beam,what is the defect?
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please give a brief description of the formation of the rainbow.
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Name the light sensitive cells which form the retina of a human eye.
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what are the advantages of a solenoid over a toroid?
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A symmetric convex lens(r₁=r₂) of refractive index 1.5 is placed in air medium.prove that the focal length f=r₁=r₂.
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Please explain the working of a solar cell.
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sir is distance travelled in nth second is = to displacement in nth second???
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Ques. A ball is dropped from a height of 5 m onto a sandy floor and penetrates the sand up to 10 cm before coming to rest . Find the retardation of the ball in sand assuming it to be uniform .
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Ques . A car travelling at 60 km/h overtakes another car traveling at 42 km/h . Assuming each car to be 5 m long, find the time taken during the overtake and the totl road distance used for overtake .
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a mixture of feo and fe3o4when heated in air to constant weight gains 5%ofits weight the%of feo in the sample is
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A body starts from rest from a point at a distance ro>Re from the centre of earth.It reaches the surface of earth.What is the velocity acquired by the body?
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two small bodies of masses 10kg and 2okg are kept a distance 1.0m apart and released.Assuming that only muutual gravitational forces are acting,find the speeds of the particles when the sepration decreases to 0.5m.
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What does exactly make heavy nucleus unstable?
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When a tiny circular obstacle is placed in the path of light from a distant source a bright spot is seen at the centre of the shadow of the obstacle. explain why?
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In a single slit diffraction experiment,the width of the slit is made double the original width. how does this affect the size and intensity of the central diffraction band?
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What is the shape of the wavefront in each case
i) light diverging from a point source.
ii) light emerging out of a convex lens when a point source is placed at its focus?
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why are optical fibres extensively used for transmitting audio and video signals? give the working of core and cladding.
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