A thin air wedge between two flat glass plates forms bright and dark interference bands when illuminated with normally incident monochromatic light.
(a) Show that the thickness of the air wedge changes by λ/2 from one bright band to the next, where λ is the wavelength of the light.
(b) What would be the change in the thickness of the wedge between bright bands if the space were filled with a liquid with an index of refraction n?