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For an object 10 cm from a concave mirror of radius 40 cm, reflected light seems to come from:
A20 cm in front
B40 cm in front
C20 cm behind
D6.7 cm behind
Answer & Solution
Correct answer: C. 20 cm behind
f = -20 cm, u = -10 cm, so 1/v = -1/20 + 1/10 = 1/20 and v = +20 cm, a virtual image behind the mirror.
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