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 th

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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 :

TestHub · Accepted Answer

​ v n 2 ​ ​ − u n 1 ​ ​ R n 2 ​ − n 1 ​ ​ v 1.4 ​ − − 13 1.3 ​ = R 0.1 ​ v 1.4 ​ = 10 R 1 − R ​ v 1.4 ​ = 10 R 1 − R ​ m = u / n 1 ​ v / n 2 ​ ​ − 2 × 1.3 ( − 13 ) ​ = 1 − R 10 R ​ R = 3 2 ​ cm ​

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