a concave lens has focal length of 20cm at what distance from the lens a 5 cm tall object be placed so that it forms an image at a distance of 15 cm for the lens ? also calculate the size of the image formed .
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At what distance from the lens a 5 cm tall object be placed so ... Also calculate the size of the image formed. ... f=- 20cm. v=-15. 1 over v minus 1 over u equals 1 over f
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