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An object is to be made to produce a real and inverted image of exactly the same size as itself using a convex lens. At which position must the object be placed?
ABetween F1 and the optical centre O
BAt the principal focus F1
CAt 2F1 (twice the focal length)
DAt infinity from the lens
Answer & Solution
Correct answer: C. At 2F1 (twice the focal length)
1. From the convex-lens table, an object at 2F1 forms its image at 2F2.
2. At this position the image is the same size as the object, and real and inverted.
3. Objects at F1 or beyond 2F1 give very large or smaller images, so they are ruled out.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 7 "Lenses", p.92_
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