CBSE Class 10 Answered
An object is placed in front of a concave mirror of focal length 20cm. The image formed is 3 times the size of the object. Calculate two possible dictances of the object from the mirror.
Asked by Srishti Mallick | 08 Oct, 2013, 08:14: PM
Expert Answer
The mirror formula is
1/f = (1/v) + (1/u) .. (1)
Given
f = focal length = -20cm
v = image distance
u = object distance
we will assume that the following is given
hi = image height
ho = object height
hi = 3ho
or
hi / ho = 3
Now,
hi / ho = -v/u = 3
we get,
v = -3u
so, using this in eq. (1), we get
-1/20 = -1/3u + 1/u
or
-1/20 = 2 / 3u
or
u = -13.33 cm
Thus, the objects distance / position of the object will be
u = -13.33 cm
Answered by Faiza Lambe | 08 Oct, 2013, 09:45: PM
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