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What is the focal length having power of +4.5D

Answer» GIVEN:Power of a lens = +4.5D.To find:Focal length of lens.Concept:Power of lens is an index of understanding the converging or diverging capability of a lens.If power is POSITIVE , then it's a CONVEX lens . If power is negative, then it's a Concave lens.The reciprocal of power gives focal length of lens in metres unit.Calculation:So FINAL answer is :Additional information:SINCE power or Focal length of the given lens is coming positive ,we can understand that : Lens is Convex lensLens is converging in nature.


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