2.1/5 points | Previous Answers white light shines down on a thin glass sheet (n

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2.1/5 points | Previous Answers white light shines down on a thin glass sheet (n air on both sides. The sheet is 347 nm thick. Wy Notes Ask Your 15) that is surrounded by (a) The phase (wave) shift for light reflected off of the top surface of the glass sheet is (b) The phase (wave) shift for light reflected off of the back surface of the glass is (c) The equation 2t = m(Nn) for this problem describes athe interferon Calculate the wavelengths (in nm) of visible light (400 to 700 nm) that will be strongly reflected by this sheet. (There will be more than one wavelength.) HINT: Use the equation for constructive interference, but rewrite it as -... Then calculate when m = 0, 1, 2, Find the wavelengths which are in the range of 400 to 700 nm. These are the wavelengths that will be strongly reflected by the thin glass sheet. Enter your answers with THREE SIGNIFICANT FIGURES. 8 - (d) Longer wavelength= (e) Shorter wavelength = x nm nm Viewing Saved Work Revert to Last Response 3. . 0.1 points Previous Answers My Notes Ask Your A physicist visits a wealthy friend (marketing major) who has a swimming pool. The physicist (a theoretician) accidentally spills a few drops of suntan lotion and a thin oil film (n1.25) spreads over the water. The physicist observes that there is maximum reflection for light of wavelength 598 nm at normal incidence. Calculate the minimum thickness of the oil film. Please enter THREE SIGNIFICANT FIGURES for your answer.

Explanation / Answer

1. The optical path difference at normal incidence should be 2pi, that is

2n(2pi/lambda) d = 2pi

solving for d

we get

d = lamda/2n = 598/2*1.25 nm = 239.2 nm.

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