During the dispersion of white light by a prism, which of the following colours deviate second least?

[0.8 mark]

Orange

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Violet

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Red

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Indigo

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Solution

The correct option is A Orange
During the dispersion of white light by a prism, light deviates. As the wavelength of light increases, the angle of deviation decreases. Orange has the second-highest wavelength, hence it will have the second least deviation.

The order of colours based on the deviation is:
Violet > Indigo > Blue > Green > Yellow > Orange > Red

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