what is the focal length of double concave lens kept in air with two spherical surface of radii R1 30cm and R2 60cm take refractive index lens as n=1.5
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We can easily calculate the focal length just by dividing the radius of the special surface by 2.
So, the focal length of one surface will be 15cm and the other surface will be 30cm.
Am I correct???
So, the focal length of one surface will be 15cm and the other surface will be 30cm.
Am I correct???
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