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Question
A concave mirror produces three times magnified (enlarged) real image of object placed at 10 cm in front of it. Where is the image located?
Solution
Magnification produced by a spherical mirror is given by the relation,
`m=h_1/h_0=-u/v`
Let the height of the object, `h_0=h`
Then, height of the image, `h_1=-3h `(image formed is real)
`-3h/h=-v/u`
`v/u=3`
Object distance, u = –10 cm
v = 3 × (–10) = –30 cm
Here, the negative sign indicates that an inverted image is formed at a distance of
30 cm in front of the given concave mirror.
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