An eyeglass lens is cut with one surface having a radius R₁ and the other surface having a radius R₂,with R₁

Question

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 R₁ being the side closer to the eye.Is this convex-concave lens a converging lens or a diverging lens? A)This is a converging lens. 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 neither,since a lens cannot be made this way.

Quizplus · Accepted Answer

A convex-concave lens with R₁ < R₂ is a diverging lens because the surface with the smaller radius (R₁) is more curved and closer to the eye, causing light rays to diverge.

An Eyeglass Lens Is Cut with One Surface Having a Radius