Maharashtra Class 9 Answered
a convex mirror has a focal length of 18cm . the image of an object kept in front of the mirror is half the height of the object .what is the distance of the object from the mirror
Asked by sujalzende1350 | 29 Jan, 2020, 09:54: PM
Expert Answer
magnification m = -v/u = 1/2 , hence u = -2v
where u and v are mirror-to-object and mirror-to-image distance respectively
we have mirror equation as, (1/v) + (1/u) = 1/f
hence , ( -2/u ) + (1/u) = 1/18
By solving above eqn., we get u = -6 cm
i.e. object is placed at 6 cm in front of the mirror
Answered by Thiyagarajan K | 30 Jan, 2020, 08:48: AM
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