Concept explainers
The sketch of the grating spectra with its labels.

Answer to Problem 86P
The diffraction spectra is given in figure 1.
Explanation of Solution
The wavelength of the red light is
Write the expression for slit separation
Here,
Substitute
Write the expression for diffraction maxima
Here,
Rearrange for
Write the expression for
Here,
Rearrange for
Substitute (II) in (III)
Substitute
Substitute
Substitute
Substitute
Substitute
The blue light and red light overlap for the central fringe and hence it appears purple.
The grating spectra drawn using the above information is given below:
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Chapter 25 Solutions
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