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Question
What are the three smallest non-zero thicknesses of soapy water ($n = 1.33$) on Plexiglas if it appears green (constructively reflecting 520-nm light) when illuminated perpendicularly by white light? Explicitly show how you follow the steps in Problem Solving Strategies for Wave Optics.
$t_2 = 195 \textrm{ nm}$
$t_3 = 390 \textrm{ nm}$
$t_4 = 585 \textrm{ nm}$
Solution Video