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# Optics Wavelength of a Beam of Light Reflected by Oil

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A layer of oil of thickness 200nm floats on top of a layer of water of thickness 400nm resting on a flat metallic mirror. The index of refraction of oil is 1.24 and that of the water is 1.33. A beam of light is normally incident on these layers. What must be the wavelength of the beam if the light reflected by the top surface of oil is to interfere destructively with the light reflected by the mirror?

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#### Solution Preview

A layer of oil of thickness 200nm floats on top of a layer of water of thickness 400nm resting on a flat metallic mirror. The index of refraction of oil is 1.24 and that of the water is 1.33. a beam of light is normally incident on these layers. What must be the wavelength of the beam if the light reflected by the top surface of oil is to interfere destructively with the light reflected by the mirror?

Solution:

Light reflected from oil film

200 nm Oil (Î¼oil = 1.24)

400 nm Water (Î¼water = 1.33)
Light reflected from ...

#### Solution Summary

This solution provide step by step calculations for optics wavelength of a beam of light reflected by oil.

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