A very thin sheet of plastic (n=1.55) covers one slit of a double-slit apparatus illuminated by...
A very thin sheet of plastic (n=1.55) covers one slit of a double-slit apparatus illuminated by 630 nm light. The center point on the screen, instead of being a maximum, is dark.
What is the (minimum) thickness of the plastic?
Homework Answers
For the Center point on the screen to go dark from light ,the
phase difference must be equal to 
.
i.e
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A very thin sheet of plastic (n=1.55) covers one slit of a
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