Describe an activity to determine focal length of concave mirror.
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Hold a concave mirror in your hand and direct it towards the screen. Direct the light reflected by the mirror on to a sheet of paper held close to the mirror. Move the sheet back and forth slowly until a bright, sharp spot of light is seen on the paper.
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Activity : Hold a concave mirror in your hand and direct it towards the screen. Direct the light reflected by the mirror on to a sheet of paper held close to the mirror. Move the sheet back and forth slowly until a bright, sharp spot of light is seen on the paper.
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