Question

At what distance from a concave lens of focal length 20cm and 6cm tall object to be placed so as to obtain its image at 15cm from the lens? Also calculate the size of the image.

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Answer 1

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Answer 2

by the lens formula

(1/20 =1/15-1/u ) and ans would come that the object should be be placed 60 cm away

the size obtained would be 15/60 or 1/4 or 0.25

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