alleryLinear magnification produced by a converging lens for an object at 2F is:
A+2 in standard practice
BExactly -1
C-2
DZero
Answer & Solution
Correct answer: B. Exactly -1
1. Object at 2F produces image at 2F on the other side, same size and inverted.
2. m = v / u = (+2f) / (-2f) = -1.
3. Magnitude is 1, sign is negative.
4. Hence magnification is exactly -1.
_Source: Selina Concise Physics ICSE Class 10, Ch 5 'Refraction through a Lens' (aplustopper.com extract)_
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