In order to obtain a magnification of , -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.
Also state the reason of your answer.
Given that,
m=h2/h1= - v/u=-2
It means that image is real and inverted.
and v=2u
Using mirror formula,
1/v +1/u=1/f
1/2u +1/u=1/f
or u=1.5 f
So the correct option is (b) between focus and centre of curvature.
m=h2/h1= - v/u=-2
It means that image is real and inverted.
and v=2u
Using mirror formula,
1/v +1/u=1/f
1/2u +1/u=1/f
or u=1.5 f
So the correct option is (b) between focus and centre of curvature.