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an object and a concave mirror of focal length 20 cm approach each other with a speed of 1 cm/s and 2 cm/s respectively. at the instant when the object is at a distance of 15 cm from the mirror the speed of image isa:50 cm/sb:18 cm/s |
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Answer» an object and a concave mirror of focal length 20 cm approach each other with a speed of 1 cm/s and 2 cm/s respectively. at the instant when the object is at a distance of 15 cm from the mirror the speed of image is a:50 cm/s b:18 cm/s |
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