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The image distance is taken to be negative for which kind of image?
AA reduced image
BA virtual image
CA real image
DAn upright image
Answer & Solution
Correct answer: B. A virtual image
1. The sign convention runs the other way for the second type.
2. The image distance is positive for a real image.
3. It is negative for a virtual image.
4. The sign therefore encodes which side of the lens the image lies on.
_Source: OpenStax College Physics for AP Courses 2e (CC BY 4.0), Ch 25 'Geometric Optics', sections 25.1-25.7_
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