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## Homework Statement

Light of wavelength 640 nm in water illuminates a glass (n = 1.5) wedge submerged in water (n = 1.33). If the distance between successive bright fringes is 6mm.

Find a) the change in thickness of the glass between these fringes

and b) the angle of the wedge

## Homework Equations

## The Attempt at a Solution

Since it's a bright fringe and n=1 to n=1.5 to n=1.33, it's constructive so 2t= (m+1/2)lambda/nfilm. WHen i plug in the values i get t=(m+1/2)(6.40X10^-7 m)/2(2.5) but I'm not sure how i can find m with the distance between the bright fringes (y=6X10^-3 m)...

And for the angle of the wedge i thought that it would be pi since n=1 to n=1.5 to n=1.33.