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Question

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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Solution

We know that,

Magnification poduced by a spherical mirror = m=h2h1=vu

m=vu=2

v=2u

Using the mirror formula 1f=1v+1u we get

1f=12u+1u

u=1.5f

Thus, the object should be placed between focus and centre of curvature.

Hence option (b) is correct.


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