Question

A Student focuses a sharp image of sun using a spherical mirror on a sheet of paper, which starts to burn after some time. Which of the following statement/statements about the mirror is/are correct?

1. It is concave spherical mirror
2. It is positive focal length
3. It is a converging mirror

• A. iii only
• B. i only
• C. i, iii
• D. All

Answer 1

Answer:

C. i, iii

• A concave mirror focuses parallel light rays to a single point, making it a converging mirror and causing the paper to burn.

• It has a positive focal length as well.

• The rays from the Sun are parallel. When these rays fall on the concave mirror, they are converged to a single point on the focal plane of the mirror.