A meniscus lens is made of a material of refractive index \( \mu_{2} \). Both its surfaces have ...

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A meniscus lens is made of a material of refractive index \( \mu_{2} \). Both its surfaces have radii of curvature \( \mathrm{R} \). It has two different media of refractive indices \( \mu_{1} \) and \( \mu_{3} \) respectively, on its two sides (see figure). Calculate its focal length for \( \mu_{1}\mu_{2}\mu_{3} \), when light is incident on it as shown.
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