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At what distance from a concave mirror of focal length 10cm should an object 2cm long be placed in order to get an erect image 6cm tall? |
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Answer» Given that focal length, f= -10cm Magnification, m= Image height/ Object height= 6/2 = 3 Also magnification= - v/u 3= -v/u v= -3u As 1/u + 1/v = 1/f 1/u + 1/-3u = 1/ -10 Therefore u= -6.667 So object should be placed at a distance of 6.667 cm in front of the mirror. |
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