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A diverging lens is made of material wit...

A diverging lens is made of material with refractive index `1.3` and has identical concaves surfaces of radius `20 cm.` The lens is immersed in a transparent medium with refractive index `1.8.`
(a) What is now the focal length of the lens?
(b) What is the minimum distance taht an immersed object must be from the lens so that a real image is formed?

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