1.

Define the principal focus of a concave mirror the radius of curvature of a spherical mirror is 20 cm. What is its focal length? Name the mirror that can give an erect and enlarged image of an object.

Answer»

Principle focus of a concave mirror is a point on the principal axis at which a beam of light incident parallel to the principal axis converges after reflection from the concave mirror.
Focal length of a spherical mirror = 1/2 × radius of curvature

\(\frac{1}{2}\) x 20 = 10 cm

∴ f = 10 cm

Concave mirror gives an erect and enlarged image of an object.



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