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A glass surface is coated by an oil film of uniform thickness 1.00 x 10-4 cm. The index of
refraction of the oil is 1.25 and that of the glass is 1.50. Some of the wavelengths in visible
region (400 nm
490 nm) are completely transmitted by the oil film under normal incidence.
n x 10
One of the wavelength transmitted completely in visible region is
m. Find the value
11
of n.

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