A student focussed the image of a candle flame on a white screen using a convex lens.
Channel: Doubtnut
Date: 2020-07-26

A student focussed the image of a candle flame on a white screen using a convex lens. He noted down the position of the candle, screen and the lens as under  Position of candle `= 12.0 cm`  Position of convex lens `= 50.0 cm`  Position of the screen `= 88.0 cm`  (i) What is the focal length of the convex lens ?  (ii) Where will the image be formed if he shifts the candle towards the lens at a position of `31.0 cm`.  (iii) What will be the nature of the image formed if he further shifts the candle towards the lens ?  (iv) Draw a ray diagram to show the formation of the image in case (iii) as said above.