Jisho

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おうめんきょう 凹面鏡
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Noun
1. concave mirror​
Wikipedia definition
2. Curved mirror​A curved mirror is a mirror with a curved reflective surface, which may be either convex (bulging outward) or concave (bulging inward). Most curved mirrors have surfaces that are shaped like part of a sphere, but other shapes are sometimes used in optical devices. The most common non-spherical type are parabolic reflectors, found in optical devices such as reflecting telescopes that need to image distant objects, since spherical mirror systems suffer from spherical aberration.
Read “Curved mirror” on English Wikipedia
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