A student wants to project the image of a candle flame on the walls of the school laboratory by using a lens At what distance in terms of focal length F of the lens should be placed the candle flame so as to get (a) a magnified, and (b) a diminished imaged respectively on the wall?

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Solution

Explanation:
(a)
A convex lens should be used since it forms real images.
To create a magnified image on the wall, place the candle flame between F and 2F from the lens.
The ray diagram is given below.

(b)
To produce a diminished image on the wall, the candle flame should be placed at a distance greater than 2F from the lens.
The illustrated ray diagram is given below.

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