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

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Solution

(a) Between focus and centre of curvature - Because magnification of -3 means image is magnified and inverted.
Diagram:

(b) Between pole and focus - Because magnification of +2.5 means image is magnified and erect.
Diagram:

(c) Beyond the centre of curvature - Because magnification of -0.4 means image is diminished and inverted.
Diagram:

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Between which two points of a concave mirror should an object be placed to obtain a magnification of 3?

Q. An object is placed at a distance of 30 cm. from a concave mirror. The magnification produced is

1 / 2

. where should the object be placed to get the magnification of 1/3.

In order to obtain a magnification of −2 (minus 2) with a concave mirror, the object should be placed:
(a) between pole and focus
(b) between focus and centre of curvature
(c) at the centre of curvature
(d) beyond the centre of curvature

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