We use the hair to treat it as the difference between the hold to make diffraction of light
The distance from the card to wall is 131.2cm
the measured distance between the two first order minima is 1.7cm
by using the formula y=L入/d
and by finding the value we get 5.17*10^-5 m
If we use a micrometer to measure the diameter, we get 0.037mm which is 3.7*10^-5 m
the numbers are in the same order of magnitude
But the uncertainties for using the hair as a split for the whole is greater because there are more uncertainties because it is really hard to measure the distance between the two first order minima due to the lack of precision in equipment (ruler). On the other, the micrometer is build to measure precise small length. But it is way cheaper to measure the diameter of hair by using a laser beam and piece of card to measure the diameter of the hair
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