677.
Problem 47.19 (RHK)
White light is incident on a grating. We have to show that no matter what the value of the grating spacing d is, the second- and third-order spectra will overlap.
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The spread of the visible light in the second- and third-order spectra will therefore be
2nd order
.
3rd order
We note that
is not . Therefore, the second and third orders of the white light spectra will overlap irrespective of the grating spacing.
is incident on a grating.
We have to show that no matter what the value
of the grating spacing d
is, the second- and
third-order spectra will overlap.
.
.
is not
.
Therefore, the second and third orders of the white light spectra
will overlap irrespective of the grating spacing.