If the focal length of a spherical mirror is -10 cm, what type of mirror is it?

Concave mirror

Convex mirror

Plane mirror

None of the above

Answer and Solution

A. Concave mirror

A negative focal length corresponds to a concave mirror since concave mirrors always have negative focal lengths in the sign convention.

Watch Video Solution

Keep Practising

Students who asked this also explored

Continue with nearby questions to strengthen the same chapter concept while you still have the context fresh in mind.

Q1.

The radius of curvature of a concave mirror is 30 cm. What is the focal length?

Q2.

An object distance (u) is given as -20 cm in a concave mirror. Which of the following options is true about its distance?

Q3.

If the image distance (v) from a convex mirror is +5 cm, what can be said about the image?

Q4.

The magnification (m) produced by a spherical mirror is negative. What does this indicate?