Question

Between which two points of concave mirror should an object be placed to obtain a magnification of
(a) −3
(b) +2.5
(c) −0.4

Answer 1

Answer:

a) object must be put between C and F

b) ..... .... ... .... ............... F and P

c) ...... ...... ..... ..... beyond C

Answer 2

(a) Centre of curvature and focus

(b) Focus and pole

(c) Beyond the centre of curvature

Explanation:

(a) The mirror should be placed between the centre of curvature and the focus to obtain a magnification of -3. When the magnification sign is negative, it indicates that the image is inverted.

 (b) The concave mirror should be placed between the focus and pole to obtain a magnification of +2.5.

(c) The concave mirror should be placed beyond the centre of curvature to obtain a magnification of -0.4.