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The radius of curvature of a spherical mirror is 20 cm. What is its focal length?
Find the focal length of a convex mirror whose radius of curvature is 32 cm.
Hold a concave mirror in your hand and direct its reflecting surface towards the sun. Direct the light reflected by the mirror on to a white card-board held close to the mirror. Move the card-board back and forth gradually until you find a bright, sharp spot of light on the board. This spot of light is the image of the sun on the sheet of paper; which is also termed as "Principal Focus" of the concave mirror.
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