![What is the focal length of double concave lens kept in air with two spherical surface of radii ${{R}_{1}}=30cm$ and ${{R}_{2}}=60cm$. Take the refractive index of the lens as $\\mu =1.5$. What is the focal length of double concave lens kept in air with two spherical surface of radii ${{R}_{1}}=30cm$ and ${{R}_{2}}=60cm$. Take the refractive index of the lens as $\\mu =1.5$.](https://www.vedantu.com/question-sets/beedec40-bb0b-457c-9326-197b8780508b8490719313182854849.png)
What is the focal length of double concave lens kept in air with two spherical surface of radii ${{R}_{1}}=30cm$ and ${{R}_{2}}=60cm$. Take the refractive index of the lens as $\\mu =1.5$.
![2 symmetric double concave lenses A and B have same focal length ,but the radii of curvature differ so that - Science - Light - Reflection and Refraction - 11869337 | Meritnation.com 2 symmetric double concave lenses A and B have same focal length ,but the radii of curvature differ so that - Science - Light - Reflection and Refraction - 11869337 | Meritnation.com](https://s3mn.mnimgs.com/img/shared/content_ck_images/ck_59e79a0567e11.jpg)
2 symmetric double concave lenses A and B have same focal length ,but the radii of curvature differ so that - Science - Light - Reflection and Refraction - 11869337 | Meritnation.com
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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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![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
A double convex lens of focal length 6 cm is made of glass of mu = 1.5. The radius of curvature, for one surface is double of the other surface. The largest
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