Question

The radius of curvature of a concave mirror is $\text{12 cm}$. If I want to capture the image of the sun, at what distance from the pole of the mirror would an image be formed?

• A. 6

Answer 1

The correct option is A 6

Given,
Radius of curvature $=12cm$
If the object is placed at infinity the image is formed at the focus.

We know the focal length(F) is half the radius of curvature(R).
$F=\frac{R}{2}$

$F=\frac{12}{2}$

$⟹$ $F=6cm$

So the image of the sun is at $6cm$ from the pole.