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# Wave Optics: Interference in thin films/wedge shaped film.

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Two rectangular optically flat plates (n=1.52) are in contact along one end and are separated along the other end by a 2.00 micrometer thick spacer. The top plate is illuminated by monochromatic light of wavelength 546.1 nm. Calculate the number of dark parallel bands crossing the top plate (including the dark band at zero thickness along the edge of contact between the two plates).

https://brainmass.com/physics/optics/wave-optics-interference-thin-films-wedge-shaped-film-59364

#### Solution Preview

Two rectangular optically flat plates (n=1.52) are in contact along one end and are separated along the other end by a 2.00 micrometer thick spacer. The top plate is illuminated by monochromatic light of wavelength 546.1 nm. Calculate the number of dark parallel bands crossing the top plate (including the dark band at zero thickness along the edge of contact between the two plates).

This is the problem related with interference with thin films

A thin wedge shaped air film is formed between the two plates. A part of light incident on the upper plate gets refracted ...

#### Solution Summary

Two plates are placed to form a wedge shaped film of air, number of dark bands calculated.

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