Which of the following colours has the least wavelength?

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Red

Orange

Violet

Blue

answer is C.

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Detailed Solution

Violet colour has the least wavelength.
The wavelength of blue or violet light is around

400 - 440 nm

. Red light has the longest wavelength in the VIBGYOR series. VIBGYOR is a combination of seven colours of light to form white light. Given lights are in ascending order of their wavelength, they are as follows: Violet < Blue < Orange < Red.

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