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  4. The power of a equi-concave lens is -4.5 and is made of an material of R.I. 1.6, the radii of curvature of the lens is

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Q. The power of a equi-concave lens is −4.5 and is made of an material of R.I. 1.6, the radii of curvature of the lens is

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Solution:

p=1f=(μ−1)(1−R−1R)