I have this question for my physics assignment.(adsbygoogle = window.adsbygoogle || []).push({});

1. The problem statement, all variables and given/known data

Two plane glass plates 10.0 cm long, touching at one end , are separated at the other end by strip of paper 1.5x10[itex]^{-3}[/itex] mm thick. When the plates are illuminated by monochromatic light, the avreage distance between constructive dark fringes is 0.20 cm calculate the wave length of the light.

I used the equation 2t=[itex]\frac{λ}{2}[/itex] but it gives me the wavelength of light in glass and I am looking for wavelength in air. please help

My physics book doesn't say how to do this type of question :(

2. Relevant equations

how to solve this question?

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# Homework Help: Interference in Air Wedges exercise

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