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Question

A student wants 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.


Solution

a) The student should use a convex lens because with the help of convex lens, he would be able to project image on the walls because convex lens will form a real image. 

b)  (i) In order to form a magnified image on the wall, the candle flame should  be placed between F and 2F from the lens.
     (ii) In order to form a diminished image on the wall, the candle flame should be placed at a distance greater than 2F from the lens.

743057_494504_ans_6a35393a484a4b8fabb88ea3c7611d8f.PNG

Physics

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