In
a particular grating the sodium doublet is viewed in third order at
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Solution: Click For PDF Version (a) The grating equation is
We calculate
first the ruling spacing d
using the information that in the third order,
(b) The other information is that the doublet is barely resolvable in the third order. Using the expression for the resolving power of grating we find the total number of rulings N in the grating.
Therefore, the total width of the grating will be
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to the normal and is barely resolved.
We have to find (a)
the ruling spacing and
(b) the total width of the grating.
,
the doublet occurs at
.
.