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Visible Radiation (Noun)

(physics) electromagnetic radiation that can produce a visual sensation; "the light was filtered through a soft glass window".

Nouns denoting natural phenomena.

Light passing through a prism demonstrates the beautiful colors of visible radiation.
The intensity of the sun's visible radiation decreases dramatically as the sun sets below the horizon.
When visible radiation passes from air to water its wavelength shortens significantly due to a decrease in speed.
Sunglasses block a large portion of the sun's visible radiation which would otherwise damage human eyes.
The average human eye can detect a wide range of visible radiation but nothing that's ultraviolet or X-rays.