What is the focal length of double concave lens kept in air with two spherical surfaces of radii R1=-30cm and R2=-60cm ? Take refractive index of lens as n=1.5Please i want this answer fastly Pls explain the answer briefly

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

1.	What is the focal length of double concave lens kept in air with two spherical surfaces of radii R1=-30cm and R2=-60cm ? Take refractive index of lens as n=1.5Please i want this answer fastly Pls explain the answer briefly
Answer» we know that F = R by 2 where R is radius and F = focal length THEREFORE FIRST concave lens it must be F = 30 by 2 ie = 15 CM and the SECOND F =60 by 2 ie = 30 cm

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What is the focal length of double concave lens kept in air with two spherical surfaces of radii R1=-30cm and R2=-60cm ? Take refractive index of lens as n=1.5Please i want this answer fastly Pls explain the answer briefly

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