Which surface of a typical meniscus lens is convex?

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Prepare for the NBEO Physiological Optics Test with flashcards and multiple choice questions, each offering hints and explanations. Equip yourself for your exam!

Multiple Choice

Which surface of a typical meniscus lens is convex?

Explanation:
A meniscus lens is shaped with one surface bulging outward and the other curving inward. The outward-curving surface is the convex one. In the usual orientation of spectacle lenses, that bulging surface is in front, so the front surface is convex while the back surface is concave. This is why the correct choice is a convex front surface. If the front were concave or the back convex, you’d be describing a different lens shape, not a standard meniscus.

A meniscus lens is shaped with one surface bulging outward and the other curving inward. The outward-curving surface is the convex one. In the usual orientation of spectacle lenses, that bulging surface is in front, so the front surface is convex while the back surface is concave. This is why the correct choice is a convex front surface. If the front were concave or the back convex, you’d be describing a different lens shape, not a standard meniscus.

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