A convex mirror has a focal length of 18 centimetres. 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?
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magnification=-v/u=1/2, u=-2v...........1
where u is the mirror- to-object distance and v is mirror- to- image distance
let f be the focal length of mirror
we have mirror formula=(1/v)+(1/u)=(1/f).......2
from eq 3 we get v=9 cm
u=-18cm
object is at distance 18cm is front of mirror.
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