Question

a student wants to project the image of a candle flame on the walls of the 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 mirror, should he place the candle flame to get the magnified image on the wall?

Answer 1

a. Concave mirror: because it forms a real image which can be seen on screen

b. at f

Answer 2

(a) The student should use a convex lens as it can form a real image (on a screen). (b) (i) To get a magnified image on the wall, the candle flame should be placed between F and 2F from the lens. (ii) To get a diminished image on the wall the candle flame should be placed at a distance greater than 2F from the lens.

Answer 3

a ) he should use a concave mirror the image formed by the concave mirror could be collected on a screen

b) the candle flame should be placed in between centre of curvature and focus to get magnified image on the wall