Question

The radius of curvature of a concave mirror is 10 cm. At what distance from the pole of the mirror would an image of the sun be formed?

• A. 10 cm
• B. 5 cm
• C. 20 cm
• D. α

Answer 1

The correct option is B

5 cm

If the object is placed at infinity the image is formed at the focus.

We know the focal length is half the radius of curvature.
$F=\frac{R}{2}$ $⟹$ f = 5 cm

So the image of the sun is at 5 cm from the pole.