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Sunlight with an angle of incident of 30 degrees hits a thin oil layer, floating on...

Sunlight with an angle of incident of 30 degrees hits a thin oil layer, floating on a puddle
of water. The oil layer is 185nm thick and has an index of refraction of 1.49, the water has an
index of 1.33 and is 2mm thick.
[6] a) There is a dominant reflection of this light at what wavelength?
[2] b) What colour would this reflection appear?
[2] c) Describe in 20 words or less the polarization of the reflected light: use at least 3 from
the list here to describe the polarization of this reflection:
------polarized, linear, vertical, horizontal, right-handed, left-handed, elliptical, circular,
unpolarized, partially polarized------

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