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Light that has wavelengths of 462 nm in the air, 347 nm in the water, and 304 nm

ID: 1496846 • Letter: L

Question

Light that has wavelengths of 462 nm in the air, 347 nm in the water, and 304 nm in the glass is incident normally upon a thin film of water from above (from the air). Calculate the minimum, non-zero thickness (in nm) of the water film that will give a transmission maximum .

air n = 1.00

water n=1.33

glass n = 1.52

Also,

The phase shift uponreflection off the water is ___ rad.

The phase shift uponreflection off the glass is ___ rad.
A transmission maximum gives a reflection ____________________.

Explanation / Answer

for maximum transmission

2nwt = m x wavelength in air

2x1.33xt = 1x 462nm

t = 173.684 nm

The phase shift uponreflection off the water is 3.14 rad.

The phase shift uponreflection off the glass is 3.14 rad.

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