A very thin sheet of plastic ( n =1.60) covers one slit of a double-slit apparat

Question

A very thin sheet of plastic (n=1.60) covers one slit of a double-slit apparatus illuminated by620 nm light. The center point on the screen, instead of being a maximum, is dark.

Part A

What is the (minimum) thickness of the plastic?

Express your answer to two significant figures and include the appropriate units.

A very thin sheet of plastic (n=1.60) covers one slit of a double-slit apparatus illuminated by620 nm light. The center point on the screen, instead of being a maximum, is dark.

Part A

What is the (minimum) thickness of the plastic?

Express your answer to two significant figures and include the appropriate units.

Explanation / Answer

Nplastic Nair =

t/plastict/

=t/(nplastic 1)

= 1/2

t =/2(nplastic 1) = 517nm.

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