Question

How will the magnitude of magnification change if an object placed at center of curvature of a concave mirror is moved towards focus in the case of a concave mirror?

• A. decreases
• B. increases
• C. remains constant
• D. magnification reaches infinity

Answer 1

The correct option is B

increases

In case of a concave mirror as the object moves towards focus; the height of image increases. Since, $\text{magnification}=\frac{\text{height of image}}{\text{height of object}}$
= $\frac{\text{- Image distance from the mirror}}{\text{Object distance from the mirror}}$

As the object distance decreases, image distance increases and both collectively supports in the magnification of the image.