Diffused monochromatic light with wavelength = 0.60m falls on a thin film with refractive index n =

Question:

Diffused monochromatic light with wavelength λ = 0.60μm falls on a thin film with refractive index n = 1.5. Determine the film thickness if the angular separation of neighbouring maxima observed in reflected light at the angles close to θ = 45° to the normal is equal to δθ = 3.0°.