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For a concave mirror, focal length (f) is negative, f
When an object s placed on the left side of the mirror, the object distance (u) is negative, u
Using lens formula
1/ v - 1/ u = 1/f
1/v = 1/f -1/u ......(i)
The object lies between f and 2f
2f
1/2f>1/u>1/f
1/f -1/2f
Using equation (i) we get
1/2f
or, 1/2f
or, 2f>v
-v>-2f
Therefore, the image lies beyond 2f
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