Question

How come UV is invisible to us?

Answer 1

Explanation:

If a body is hot enough to emit in UV it will still emit in visible light, and will actually emit more EM radiation at optical wavelengths that when it was colder and the peak was in visible light. So, no invisibility here.

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Answer 2

The lens of the human eye blocks most radiation in the wavelength range of 300–400 nm; shorter wavelengths are blocked by the cornea.Humans also lack color receptor adaptations for ultraviolet rays. Nevertheless, the photoreceptors of the retina are sensitive to near-UV, and people lacking a lens (a condition known as aphakia) perceive near-UV as whitish-blue or whitish-violet.

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