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(a) What is the order of longest visible wavelength ? Which colour has it ? (b) What is the order of shortest visible wavelength ? Which colour has it

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(a) What is the order of longest visible wavelength ? Which colour has it ?
(b) What is the order of shortest visible wavelength ? Which colour has it ?

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(a) The longest visible wavelength is `~~ 8000 A^@`. It is of red colour.
(b) The shortest visible wavelength is `~~ 4000 A^@`. It is of violet colour.
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