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The focal length of an eqniconvex lens i...

The focal length of an eqniconvex lens is equal to the radius of curvature of either face. What is the value of refractive index of the material same of the lens?

Text Solution

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`1/f = (mu - 1) ((1)/(R_1) - (1)/(R_2))`
` 1/f = (mu - 1) (2/f) " " (therefore f = R )`
`1/2 = (mu - 1)`
`mu = 1.5`
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