A student want to project the image of a candle flame on the walls of school laboratory by using a lens: (a) Which type of lens should he use and why? (b) At what distance in terms of focal length 'F' of the lens should he place the candle flame so as to get (i) a magnified, and (ii) a diminished image respectively on the wall? (c) Draw ray diagram to show the formation of the image in each case.

A student want to project the image of a candle flame on the walls of

1.	A student want to project the image of a candle flame on the walls of school laboratory by using a lens: (a) Which type of lens should he use and why? (b) At what distance in terms of focal length 'F' of the lens should he place the candle flame so as to get (i) a magnified, and (ii) a diminished image respectively on the wall? (c) Draw ray diagram to show the formation of the image in each case.
Answer» Solution :(a) A convex LENS should be USED. This is because it can produce a real image of the candle flame on the wall as it is a converging lens where refracted ray actually meet. (b) & (c )(i) A real MAGNIFIED image is formed when the candle flame is placed between F and 2F from the convex lens on the other SIDE of the wall. (ii) A real diminished image is formed when the candle flame is placed beyond 2F from the convex lens on the other side of the wall.