Discussion
The visible spectrum extends over approximately which range of wavelengths?
Answer: A
Correct answer: 380 to 780 nanometres
The visible band runs from about 380 nm at the violet end to about 780 nm at the red, with the exact limits depending on how much sensitivity is deemed sufficient. Below it lies the ultraviolet and above it the infrared, and it is a very narrow window in the electromagnetic spectrum - less than one octave in frequency.
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