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6. An object is placed at a distance of 20 cm before a concave mirror. A real image is obtainedat a distance of 40 cm from the mirror. Calculate the focal length of the mirror andmagnification.Ans. f = -13.3 cm, m = -2]

Answer»

V = -40 cmu = - 20 cmby mirror formula we have 1/v + 1/u = 1/f1/f = 1/-40 + 1/-201/f = (-1 - 2)/ 401/f = -3/40f = -40/3f = -13.3334 cm

m = - v/um = -(-40)/-20m = - 40/20 = -2

Therefore, Focal lenght = -13.3334 cm and Magnification = -2



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