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Per NCERT Example 9.4, a convex lens (f = +10 cm) has an object at u = −15 cm. What is the image distance v?
A−15 cm
B+30 cm (real, inverted, on the other side of the lens)
C+10 cm
D−30 cm
Answer & Solution
Correct answer: B. +30 cm (real, inverted, on the other side of the lens)
Per NCERT Example 9.4, 1/v = 1/u + 1/f = 1/(−15) + 1/10 = (−2+3)/30 = 1/30 → v = +30 cm.
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