A grating has 315 rulings/mm. We have to find the wavelengths in the visible spectrum which can be seen in the fifth-order diffraction.
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Solution: Click For PDF Version As there are 315 rulings/mm, the grating distance d is
The range of
visible spectrum is
The maximum
wavelength that can be seen in the fifth order is determined by
substituting
Therefore, we
conclude that wavelengths in the range
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.
The grating equation is
and
in the grating equation. We note that
can be seen in the fifth-order diffraction using the given grating.