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A concave mirror has f = -15 cm and an object stands 30 cm away. Reflected rays meet at:
A10 cm, virtual
B30 cm, real
C15 cm, real
D30 cm, virtual
Answer & Solution
Correct answer: B. 30 cm, real
1/v = 1/f - 1/u = -1/15 + 1/30 = -1/30, so v = -30 cm: a real image at the same distance.
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