The focal length of an equiconvex lens is equal to radius of curvature of either surface. What is the refractive index of the material of the prism ?
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Here, `R_1 = R, R_2 = -R , f = , mu = ?`
From `(1)/(f)=(mu -1)((1)/(R_1) – (1)/(R_2))`
`(1)/(R ) = (mu – 1) ((1)/( R) + (1)/( R)) = (mu – 1)(2)/( R)`
`mu – 1 = (1)/(2)` or `mu = 3//2 = 1.5`.