The difference between Optical spectrum and Visible light
When used as nouns, optical spectrum means the colours of the rainbow, whereas visible light means the part of the electromagnetic spectrum, between infrared and ultraviolet, that is visible to the human eye.
check bellow for the other definitions of Optical spectrum and Visible light
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Optical spectrum as a noun:
The colours of the rainbow.
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Optical spectrum as a noun (physics):
The distribution of colours produced when white light passes through a prism.
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Optical spectrum as a noun (astronomy, physics):
The range of frequencies of visible light.
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Visible light as a noun (physics):
The part of the electromagnetic spectrum, between infrared and ultraviolet, that is visible to the human eye.