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Explain the following terms :
Pole, Centre of curvature, Radius of curvature, Principal axis. Show them on separate diagrams for each of the concave and convex mirrors.
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What do you understand by the focus and focal length of a spherical mirror? Show them on the separate diagrams for each of a concave mirror and a convex mirror.
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How is a spherical mirror used to converge a beam of light at a point? Name the type of mirror used.
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How is a spherical mirror used to diverge a beam of light from a point? Name the type of mirror used.
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State the direction of incident ray which after reflection from a spherical mirror gets reflected along its own path. Give a reason.
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How is the focal length of a spherical mirror related to its radius
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A pump raises water by spending 4×105J of energy in 10s. Find the power of the pump.
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It takes 20 s for a girl A to climb up the stairs while girl B takes 15 s for the same job. Compare the work done .
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Which are the two convenient rays that are chosen to construct the image by a spherical mirror for a given object? Explain with the help of suitable ray diagrams.
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It takes 20 s for a girl A to climb up the stairs while girl B takes 15 s for the same job. Compare the power spent by then.
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Draw separate diagram for the formation of virtual image of an object by a concave mirror.
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State the kind of mirror used
(a) by a dentist, and
(b) as a street light reflector.
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Name the kind of mirror used to obtain
(a) a real and enlarged image
(b) a virtual and enlarged image
(c) a real and diminished image, and
(d) a virtual and diminished image.
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How is M.C.B. superior to the fuse wire?
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A straight stick partly dipped in water obliquely appears to be bent at the surface of the water.
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The sun is seen before the sunrise and after the sunset.
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A switch should not be touched with wet hands.
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A source of potential difference V volt sends current I ampere in a circuit for time t second. Write expressions for
- electrical energy supplied by the source and
- electrical power spent by the source.
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Write the full form of M.C.B?
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Rays of light incident parallel to the principal axis pass through the focus after reflection from a concave mirror.
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