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Q.

Which of the following colours has the least wavelength?


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a

Red

b

Orange

c

Violet

d

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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