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Find the focal length of a double-convex lens with `R_(1) = 15cm` and `R_(2) = -25CM`. The - YouTube
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![Two symmetrical double convex lenses A and B have same focal length, but the radii of curvature differ so that ${{R}_{B}}=0.9{{R}_{A}}$. If ${{\\mu }_{A}}=1.63$, Find $\\mu_B$. Two symmetrical double convex lenses A and B have same focal length, but the radii of curvature differ so that ${{R}_{B}}=0.9{{R}_{A}}$. If ${{\\mu }_{A}}=1.63$, Find $\\mu_B$.](https://www.vedantu.com/question-sets/588ac575-b97a-4a0a-b2ba-b9bbc824cac79179685308106379180.png)
Two symmetrical double convex lenses A and B have same focal length, but the radii of curvature differ so that ${{R}_{B}}=0.9{{R}_{A}}$. If ${{\\mu }_{A}}=1.63$, Find $\\mu_B$.
![A double convex lens has focal length 25 cm. The radius of curvature of one of the surfaces is d... - YouTube A double convex lens has focal length 25 cm. The radius of curvature of one of the surfaces is d... - YouTube](https://i.ytimg.com/vi/LKbnPDHi5l4/maxresdefault.jpg)
A double convex lens has focal length 25 cm. The radius of curvature of one of the surfaces is d... - YouTube
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