Define focal length and give mirror formula.
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Focal Length – The space between the pole P of concave mirror and the focus F is the focal length of concave mirror. ... The focal length of the convex mirror is positive, whereas that of the concave mirror is negative. The same can also be proved by using the mirror formula: (1/f = 1/v +1/u).
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The distance PF = focal length f. The distance PC = radius of curvature R of the mirror. BC is the normal to the mirror at the point of incidence B. In a similar way, we can also prove this for convex mirror.
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