An Eyeglass Lens Is Cut with One Surface Having a Radius

question 73

Multiple Choice

An eyeglass lens is cut with one surface having a radius R₁ and the other surface having a radius R₂, with R₁ < R₂. Both positive radii are measured from the same side with R₂ being the side closer to the eye. Is this convex-concave lens a converging lens or a diverging lens?

• A) This is neither, since a lens cannot be made this way.
• B) This is a diverging lens.
• C) This can be either a converging or diverging lens, as more information is needed for a final determination.
• D) This is a converging lens.

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