Question

A spherical mirror, whose inner surface is the reflecting surface, is a

• A. Concave mirror.
• B. Convex mirror.
• C. Parabolic mirror.
• D. Plane mirror.

Answer 1

The correct option is A

Concave mirror.

Explanation for the correct option

A: Concave mirror

1. A spherical mirror is a mirror that has the shape of a piece cut out of a spherical surface.
2. Concave mirror is a spherical mirror.
3. It has its outer surface polished and inner surface acts as the reflecting surface.
4. Thus, it has its reflecting surface curved inwards.

Explanation for the incorrect option(s)

B: Convex mirror

1. Convex mirror is a spherical mirror.
2. It has its inner surface polished and outer surface acts as the reflecting surface.
3. Thus, it has its reflecting surface bulged outwards.

C: Parabolic mirror

1. It is not a spherical mirror.

D: Plane mirror

1. It is not a spherical mirror.

Thus, the spherical mirror, whose inner surface is the reflecting surface, is a concave mirror. Hence option A is the correct answer.