Question

How does the magnitude of magnification change if an object placed at the centre of curvature of a concave mirror is moved towards the focus?

• A. It increases
• B. It decreases
• C. It remains constant
• D. It becomes equal to infinity

Answer 1

The correct option is A It increases

$\left(1\right)$ Initial Position
$\left(2\right)$ After moving towards focus

As the object moves towards the focus, the height of the image increases as shown in the ray diagrams.

We know that magnification, $m=\frac{\text{height of the image}}{\text{height of the object}}$

As the height of the image increases, the numerator increases, which leads to an increase in the magnitude of magnification.