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Focal point — Free Physics Illustration | GPAI | GPAI

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Focal point

Focal point

Physics

Focal point

A small, precise solid dot or pinpoint marker, typically black, cleanly defined, and circular, placed on the optical or principal axis in a simple textbook ray diagram to indicate the focal point or focus of a mirror, lens, or refracting surface. Minimal geometric symbol with no extra structure beyond its role as an optical reference point; it may optionally be accompanied by a tiny positional label.

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