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For a concave mirror producing a magnification of m = -3 with an object at u = -10 cm, using m = -v/u, the image distance v works out to be

Question
For a concave mirror producing a magnification of m = -3 with an object at u = -10 cm, using m = -v/u, the image distance v works out to be
v = -30 cm
v = +30 cm
v = -10/3 cm
v = +10/3 cm
Answer
v = -30 cm
Detailed Explanation
From m = -v/u: -3 = -v/(-10), so -3 = v/10, giving v = -30 cm.
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