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A point source of light is moving at a rate of 2cm/s towards a thin convex lens of focal length 10cm along its optical axis. When the source is 15 cm away from the lens the img moving atA)4cm/s towards LensB)8cm/s towards lensC)4cm/s away from lensD)8cm/s away from lens

A point source of light is moving at a rate of 2cm/s towards a thin convex lens of focal length 10cm along its optical axis. When the source is 15 cm away from the lens the img moving atA)4cm/s towards LensB)8cm/s towards lensC)4cm/s away from lensD)8cm/s away from lens

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