sensitive to near-UV but the lens does not focus this light properly, causing UV light bulbs to look fuzzy.People lacking a lens (a condition known as aphakia) perceive near-UV as whitish-blue or whitish-violet. Near-UV radiation is visible to insects, some mammals, and some birds. Birds have a fourth color receptor for ultraviolet rays; this, coupled with eye structures that transmit more UV gives smaller birds "true" UV vision.

History and discovery

"Ultraviolet"

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