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:

1. between centre and focus
2. between focus and pole
3. beyond c

Answer 2

Enlargement of Size is Magnification

Explanation:

The Process of Enlargement of the apparent size of an object. It can be specified with a numerical number and is called Magnification.

• For (a)

A magnification of -3 means that the image is real, inverted and magnified. So the object should be placed between F (principal focus) and C (center of curvature).

• For (b)

An object, in front of a concave mirror, should be placed between the latter's focus (F) and the pole (P) to obtain a magnification of +25.  

• For (c)

An object, in front of a concave mirror, should be placed beyond the latter's center of curvature (C) to obtain a magnification of −0.4.