What is the type of a lens of Power=−4D ? Convex lens Concavo

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jeptoto4d login alternatif Power of lens =−4D Focal length =1P=1−4=−25cm Negative value of focal length and power indicates that the lens is concave lens · Q1 A bination of convex What is the meaning of power of lenses not to exceed 4D? Is it the total combined power of 2 lenses of glasses or single individually?