A concave mirror forms an image of the sun at a distance of 12 cm from it.

Options

A. the radius of curvature of this mirror is 6cm
B. to use it as a shaving mirro, it can be held at a distance of 8-10cm from the face
C. it an object is kept at a distance of 24cm from it, the image formed will be of the same size as the object
D. all the above alternative are correct.

Answer

b.,c.

Explanation

Image of sun will be formed at the focus of mirro. Hence, focal length of mirro `=12cm`. To use it or shaving purpose, face should be between focus and pole, so that virtual image can be formed.