📝 Multiple Choice Question
General-science
A convex mirror of focal length f produces an image half the size of the object. The distance of the object from the mirror is:
A
f
B
2f
C
f/2
D
3f/2
Explanation
Magnification m = -v/u = 1/2. So v = -u/2. Using mirror formula 1/v + 1/u = 1/f -> -2/u + 1/u = 1/f -> u = -f. Distance is f.
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