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Question

In the spectrum of white light, how many colours have a wavelength less than that of yellow colour?


A

2

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B

4

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C

3

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D

5

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Solution

The correct option is B

4


White light is made up of seven constituent colours. These colours in the increasing order of wavelengths are violet, indigo, blue, green, yellow, orange, and red.
Clearly, 4 colours have a wavelength less than yellow.


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