Question

A very sharp wedge of glass of index of refraction 1.50 is introduced perpendicularly in the path of one of the interfering beams
of Michelson interferometer illuminated by a narrow beam of light of
wavelength 0.500 ?m. This causes 600 dark fringes to sweep across the
field of view. Calculate the thickness of the glass wedge at the point
where the beam passes through it.

Answer 1