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## Homework Statement

A sheet of mica ( approximate 6-7 µm) covers one slit

of a double-slit apparatus and has a n= 1.582. There is a central maximum of 539 nm. What is the exact thickness of the sheet of mica?

## Homework Equations

## The Attempt at a Solution

I think you can solve this with the number of wavelengths that go throug the sheet? But I'm a but stuck on the question.