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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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Answer» Solution :(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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