If we are to observe interference in a thin film, why must the film not be very thick (with thickness only on the order of a few wavelength)?

Interference By a thin film

For observing interference in thin films with a light of wave length lambda the thickness of the film :

Explain interference due to thin films.

What is the minimum thickness of a thin film required for constructive interference in the reflected light from it ? Given, the refractive index of the film = 1.5, wavelength of the light incident on the film = 600 nm.

What is the minimum thickness of a thin film required for constructive interference in the reflected light from it ? Give, the refractive index of the film = 1.5 wavelength of the light incident on the film = 600 nm

What is the minimum thickness of thin film required for constructive interference in the reflected light through it ? (Given, the refractive index of the film =1.5, wavelength of the lilght incident on the film =600 nm.

What is the minimum thickness of thin film required for constructive interference in the reflected light through it ? (Given, the refractive index of the film =1.5, wavelength of the lilght incident on the film =600 nm.

Thin film interference