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Nivlac2425
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Homework Statement
A sheet of plastic, n=1.6, covers the entrance of one slit of a double-slit. When the double-slit is illuminated by monochromatic light with wavelength = 586 nm, the center of the screen on the other side of the double-slit appears dark rather than light. What is the minimum thickness of this sheet of plastic?
Homework Equations
The Attempt at a Solution
I know that in order for the bright area on the screen to be dark instead of light, destructive interference must be occurring.
I can also find the velocity, v, of the light in the plastic with the equation n=c/v