Where must an object sit for a concave mirror to form a virtual, magnified, erect image?
ABetween the principal focus and the pole, behind the mirror
BBetween the principal focus and the pole, in front of the mirror
CBetween the centre of curvature and the focus, in front of the mirror
DBetween the centre of curvature and the pole, behind the mirror
Answer & Solution
Correct answer: B. Between the principal focus and the pole, in front of the mirror
1. A concave mirror produces a virtual, magnified, erect image only for one object position.
2. That position is between the principal focus and the pole, in front of the mirror.
3. There the reflected rays diverge, so they only appear to meet behind the mirror, giving a virtual image.
4. Placing the object between the centre of curvature and the focus gives a real, inverted image beyond the centre of curvature instead.
5. No object can be placed behind a mirror at all, so both options saying 'behind the mirror' are impossible.
_Source: NECTA CSEE 2022 Physics 031, Question 1: Multiple Choice, item (iv)_
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