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Blue Light is reflected from an air wedge formed by two flat glass plates

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I am having a bit of trouble with a problem in a algebra based physics course.

When blue light (wavelength 589nm)is reflected from an air wedge formed by two flat glass plates, the bright fringes are 0.6cm apart.

1) How thick is the air wedge 5.0cm from the line of contact of the plates? (the wedge is viewed at normal incidence)
2) repeat for the wedge filled with oil (index of refraction is 1.4) instead of air.

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With good exlanations and calculations, the problems are solved.

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Let two plates are inclined at an angle Q(read as theta) with one another.
For two successive fringes at 5 cm and 5.6 cm, let the thickness of air wedges are t1 and t2 respectively:
because, ...

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