Question

A student wants to project the image of a candle flame on a screen 80 cm in front of a mirror by keeping the candle flame at a distance of 20 cm from its pole.
(i) Which type of mirror should the student use? (ii) Find the magnification of the image produced.
(iii) Find the distance between the object and its image. (iv) Draw a ray diagram to show the image formation in this case and mark the distance between the object and its image.

Answer 1

i) Concave mirror should be used.

(ii) Object distance, u= - 20cm; image distance, v = - 80 cm; magnification, m= ?

Answer 2

Concave mirror

Explanation:

A student wants to project the image of a candle flame on a screen 80 cm in front of a mirror by keeping the candle flame at a distance of 20 cm from its pole.

i) Concave mirror should be used.

(ii) Object distance, u= - 20cm; image distance, v = - 80 cm

magnification, m = -v/ u = - (-80)/(-20) = -4

(iii) Distance between object and the image = v - u = 60 cm

(iv) Please refer to the attached picture for the ray diagram.