A concave lens has focal length of 20cm. at what distance from the lens is a 5cm tall object be placed so that it forms an image at 15cm from the lens?also calculate the size of the image formed.
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use lens formula 1/v-1/u=1/f ...
then 1/u=1/f-1/v=> 1/u=1/-20-1/15 now find yourself and for size use m=v/u
then 1/u=1/f-1/v=> 1/u=1/-20-1/15 now find yourself and for size use m=v/u
ustaadjeeri:
thanks
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