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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. |
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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. = \(\frac{1}{2}\) x 20 = 10 cm ∴ f = 10 cm Concave mirror gives an erect and enlarged image of an object. |
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