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A lens forming an image that cannot be caught on a screen has an image distance that is:
AUndefined
BNegative
CPositive
DExactly zero
Answer & Solution
Correct answer: B. Negative
1. The sign convention follows from the type of image.
2. A real image is one that can be projected on a screen.
3. An image that cannot be projected is a virtual image.
4. The image distance is positive for a real image and negative for a virtual image.
5. So this image distance is negative.
_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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