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A convex lens produces an image of height 6 cm from an object of height 2 cm. What is the magnification produced?
A$3$
B$4$
C$12$
D$\dfrac{1}{3}$
Answer & Solution
Correct answer: A. $3$
1. Magnification is $m = \dfrac{h'}{h}$, the ratio of image height to object height.
2. Substitute: $m = \dfrac{6}{2} = 3$.
3. Since $m > 1$, the image is enlarged, consistent with a magnified image.
4. The value $\tfrac{1}{3}$ inverts the ratio, a common slip, so it is wrong.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 2 Optics "Magnification of a Lens", p.30_
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