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The focal length of an equiconvex lens i...

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 = R, um = ?`
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`
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