Question

A student focused the image a candle flame on
a white sceen using a conter lens. He noted
down the position d'candle screen and lene as under:
Position of candle 12cm
Position of convex lens=50cm
Position of screen=88cm.
1) what is the focal length of the conver lens?
2)Where will be the image formed if he shifts the candle towards the lens at position of 31cm?​

Answer 1

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