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A mirror that curves inward, like the bowl of a spoon, and one that curves outward, like the back of the same spoon, are given what two names?
ABoth curved surfaces are simply called concave
BBoth curved surfaces are simply called convex
CThe outward-curving side is concave, the inward is convex
DThe inward-curving side is concave, the outward is convex
Answer & Solution
Correct answer: D. The inward-curving side is concave, the outward is convex
1. A mirror with a reflective side that is curved inward is called a concave mirror, like the bowl side of a spoon.
2. A mirror that curves outward instead, like the back of the same spoon, is called a convex mirror.
3. Swapping which curve gets which name is the trap the middle two options set.
4. Calling both surfaces by the same name ignores that concave and convex are kept as two distinct names precisely because they behave differently.
_Source: OpenStax Physics (CC BY 4.0), Ch 16 "Mirrors and Lenses", section 16.1 Reflection_
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