Question

A student wants to project the image of a candle flame on the walls of school laboratory by using a mirror.; (a) Which type of mirror should he use and why?; (b) At what distance in terms of focal length 'f' of the mirror should he place the candle flame so as to get the magnified image on the wall?; (c) Draw a ray diagram to show the formation of image in this case.; (d) Can he use this mirror to project a diminished image of the candle flame on the same wall? State 'how' if your answer is 'yes' and 'why not' if your answer is 'no'.(Delhi - 2014)

Answer 1

Production Image of Candle Flame

Explanation:

a) The student should use a convex lens because, with the help of a convex lens, he would be able to project an 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

c) the ray diagram is given:

d) Yes, concave mirror can be used to obtain a diminished image. When the object is placed beyond 2f, then the image formed will be diminished one