What is the focal length of double concave lens kept in air with two s – InterviewSolution

1.	What is the focal length of double concave lens kept in air with two spherical surfaces of radii R1=30 cm and R2=60 cm. Take refractive index of lens with respect to surrounding as n = 1.5.
Answer» What is the focal length of double concave lens kept in air with two spherical surfaces of radii $R_{1} = 30 c m$ and $R_{2} = 60 c m$ . Take refractive index of lens with respect to surrounding as n = 1.5.

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