Two flat plates of glass with parallel faces are on a table, one plate on the ot

Question

Two flat plates of glass with parallel faces are on a table, one plate on the other. Each plate is 11.2cm long and has a refractive index of 1.55. A very thin sheet of metal foil is inserted under the end of the upper plate to raise it slightly at that end, in a manner similar to that pictured in the figure (Figure1.). When you view the glass plates from above with reflected white light, you observe that, at 1.16mm from the line where the sheets are in contact, the violet light of wavelength 403nm is enhanced in this reflected light, but no visible light is enhanced closer to the line of contact. How far from the line of contact will green light (of wavelength 554nm ) and orange light (of wavelength 682nm ) first be enhanced? This question will be shown after you complete previous question(s). This Question will be shown after you complete previous question(s).

Explanation / Answer

a)

tan * 1.16e-3 = 403e-9/2

tan = 1.7371e-4

1.7371e-4 * x = 554e-9/2

x = 1.59 mm

b)

1.7371e-4 * x = 682e-9/2

x = 1.96 mm

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