Question

A single slit has a width of 12.7 µm. Monochromatic light from a source passes through the slit and a fourth dark fringe (on one side of the central maximum) appears at an angle of 10.0° as measured from the CM. Calculate the wavelength of light used. What colour is this?

Answer 1

\[d \sin \theta = \lambda\]
d
is the width of the slit,
\[\theta\] is the angle of incidence at which the minimum intensity occurs, and
\[\lambda\]is the wavelength of the light\

Light color corresponds to wavelenghth