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An object is placed at the centre of curvature (at 2F) of a convex lens. What is the nature and size of the image formed?
AReal, inverted and magnified
BReal, inverted and same in size
CReal, inverted and diminished
DVirtual, erect and magnified
Answer & Solution
Correct answer: B. Real, inverted and same in size
1. For a convex lens, when the object is at the centre of curvature C (2F), the image forms at the other C.
2. At this position the image is real and inverted.
3. The image size equals the object size, giving magnification of magnitude 1.
4. A magnified image would need the object between F and 2F, so that distractor is wrong.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 2 Optics "Refraction through a Convex Lens", p.27_
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