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  4. The refractive index of a diverging meniscus lens is 1.5 and its radii of curvatures are 20 cm, 25 cm. The focal power of lens is

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Q. The refractive index of a diverging meniscus lens is 1.5 and its radii of curvatures are 20 cm, 25 cm. The focal power of lens is

Solution:

Correct answer is (b) -0.5 D.