The radius of currature of each surface of a biconvex lens is 20cm. (i) Calculate its focal length if of glass = 1.5 (ii) Calculate its focal length when it is immersed in water ( = 1.33) (@9599608544

The radius of currature of each surface of a
 biconvex lens is 20cm. 
(i) Calculate its focal length if of glass = 1.5
 (ii) Calculate its focal length when it is immersed in water ( = 1.33) (

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