- #1
conniechiwa
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Homework Statement
A sheet of mica sits on glass (n = 1.8). How thick should the sheet of mica (n = 1.5) be if it is to be as thin as possible and still give rise to destructive interference for reflection of light in the blue part of the spectrum (use l = 420 nm)? (All parts of the mica except the bottom surface are still surrounded by air.)
Homework Equations
1/2 + 2t/(wavelength/n) = m
2t/(wavelength/n) = 1/2
t = (wavelength/n)/4
The Attempt at a Solution
t = (wavelength/n)/4
t = (420nm/1.8/)4
t = 58.3 nm
I'm not sure what I'm doing wrong...