Define the principal focus of a concave mirror. Write two uses of a convex mirror.
The principal focus of the concave mirror is a point on its principal 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 the rearview mirrors 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.
Define the principal focus of a concave mirror
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