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Homework Statement
A thin film of dielectric material of refractive index 1.455 and thickness 6.50 mm is now placed over one of the slits (say the right-hand one). By how much will this change the optical path between the slit and the centre of the screen?
Homework Equations
Optical Path Difference (OPD) = n(r2-r1)
Where
n = refractive index
L = length between slit and screen
r2 = length light travels from one slit
r1 = length light travels from the other slit
Optical Path Length (OPL) = nL
The Attempt at a Solution
In my lecture notes I've been given the OPD & OPL equation, however I haven't been told what happens to the OPL and thus OPD when light goes through a material of refractive index n.
I've made an attempt, which I've attached. I think I've over thought this question a bit...
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