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What is not an element of the Prentice Rule formula?

Radius of Curvature
Refractive Index
Power of the Lens
Thickness of the Lens

The correct answer is: Radius of Curvature

The Prentice Rule formula is used to calculate the induced prism in a lens. It includes the refractive index, power of the lens, and thickness of the lens. The radius of curvature is not an element of this formula and is not directly related to the calculation of prism. It is a separate measurement that is used to determine the shape of a lens and is not applicable in this context. Therefore, A is the correct answer as it is not part of the Prentice Rule formula.