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

Answer 1

The object should be placed between the focus and center of curvature in order to obtain a magnification of -2.

Explanation:

Provided:

$m = \frac{h2}{h1} = \frac{-v}{u} = -2$

As the symbol is negative, it shows that the image is inverted and real.

So, v = 2u

Using the formula of the mirror,

 $\frac{1}{v} +\frac{1}{u} =\frac{1}{f}$

 $\frac{1}{2u} +\frac{1}{u} =\frac{1}{f}$

or u = 1.5 f

So, the correct answer is (b), which is between the focus and center of curvature.

You can get all the answers of Chapter 4 in the link below:

https://brainly.in/question/14963178

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Answer 2

The correct answer is between focus and center of curvature.

This is because the minus sign signifies that it is real and inverted image

Secondly,2 is greater than so the image formed will be enlarged than object.