With
light from a gaseous discharge tube incident normally on a grating
with distance
We have to compute the wavelength of the green line that best fits the data.
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Solution: Click For PDF Version A principal maximum occurs when the path difference between rays from any pair of adjacent slits, which is given by ,
is equal to an integral number of wavelengths, or
This is called the grating equation. In our problem the slit separation d is
The principal
maxima at
So from this measurement the value of wavelength will be
The maxima
observed at
From these observations, we find the value of wavelength to be
The maxima
observed at
From these observations, we find the value of wavelength to be
From these measurements, we find the average value of the measured wavelength. It is
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between adjacent slit centres,
a green line appears with sharp maxima at
measured transmission angles
correspond to
.
correspond to
,
respectively.
correspond to
,
respectively.
