A spectrum of white light is obtained with a grating ruled with 2500 lines/cm. Compute the angular

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A spectrum of white light is obtained with a grating ruled with 2500 lines/cm. Compute the angular separation between the violet (λu = 400 nm) and red (λr = 700 nm) in the 

(a) First order and 

(b) Second order. 

(c) Does yellow (λy = 600 nm) in the third order overlap the violet in the fourth order?

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