alleryStart learning →An object is placed 25 cm in front of a concave mirror of focal length 15 cm. The image distance v is
A-9.4 cm
B+37.5 cm
C-18.75 cm
D-37.5 cm
Answer & Solution
Correct answer: D. -37.5 cm
1. Sign convention: f = -15 cm, u = -25 cm.
2. 1/v = 1/f - 1/u = (1/-15) - (1/-25).
3. 1/v = -1/15 + 1/25 = (-5+3)/75 = -2/75.
4. So v = -37.5 cm, a real image in front of the mirror.
_Source: AP/TS SCERT Class 10 Physical Science, "Reflection of Light at Curved Surfaces"_
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