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Curving inwards. A concave mirror is one in which the reflecting surface is formed from the interior surface of a sphere or paraboloid. A concave lens has at least one face formed from the interior surface of a sphere. A biconcave lens has both faces concave and is therefore thinnest at its centre. The plano-concave lens has one plane face and one concave face. The concavo-convex lens (also called a meniscus) has one concave face and one convex face. See lens.

Subjects: Physics.

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