Question

Define the principal focus of a concave mirror.

Answer 1

Answer:

Light rays that are parallel to the principal axis of a concave mirror converge at a specific point on its principal axis after reflecting from the mirror. This point is called the principal focus of the concave mirror.

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Answer 2

Answer:

The principle focus of concave mirror is a point on its principle axis to which all the light rays which are parallel and close to the axis, converge after reflection from the mirror.

Uses of convex mirrors:

• 1) Convex mirrors are used in rear view mirror in vehicles because the mirror can diverge a beam of light and create a virtual image.

• 2) Convex mirrors are used as reflectors in street lamps to diverge light over a larger area.