Visible light comprises only a segment of the electromagnetic spectrum. Which of the following presents the sequence of visible light from the shortest to the longest wavelength?
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a. orange, red, yellow, indigo, violet, blue, green
b. blue, violet, indigo, green, red, orange, yellow
c. violet, indigo, blue, green, yellow, orange, red
d. red, orange, yellow, green, blue, indigo, violet