Principal Focus of Concave Mirror,Convex Mirror.

Q16. Define principal focus of
a. Concave Mirror,
b. Convex Mirror.
Ans.
a. Principal Focus of Concave Mirror: A number of rays parallel to the principal axis after reflection from it actually meet at a point on the principal axis of the mirror. This point is called principal focus of the concave mirror.

b. Principal Focus of Convex Mirror: A number of rays parallel to the principal axis after reflection from it appears to meet at a point on the principal axis of the mirror. This point is called the principal focus of the convex mirror.

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