Question

4. A concave mirror of focal length 15 cm produces a real image at a distance 75/2 cm from the pole. What is the position of the object?

v=-10 cm
v=-25cm
u=-10 cm
u =-25 cm

Answer 1

Answer:

The real and inverted image created by a concave mirror becomes of equal size to the object when both object and images are situated on the centre of curvature.

This means that the object distance is equal to the radius of curvature for the mirror.

Radius of curvature =2× focal length of the mirror.

Given, focal length of the mirror =15cm

So, object distance = radius of curvature =2×15cm=30cm