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In a long glass tube, mixture of two liquids A and B with refractive indices 1.3 and 1.4 respectively, forms a convex refractive meniscus towards A. If an object placed at 13 cm from the vertex of the meniscus in A forms an image with a magnification of '–2' then the radius of curvature of meniscus is :

1. 1 cm
2. 3 1 cm
3. 3 2 cm
4. 3 4 cm

Correct answer: 3 2 cm

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