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fredrick08
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Homework Statement
fringes are observed when a parrallel beam of light of wavelength 500nm is incident perpendiculary onto a wedge-shaped film with an index of refraction of 1.5. What is the angle of the wedge if the fringe separation is 1/3cm?
Homework Equations
t(x)=xtan(theta)
2nt=m*lamda (m+.5) for deconstructive
x=(lamda/2)/2n*tan(theta)
t=lamda/2n
The Attempt at a Solution
ok I am really struggling to understand this qn, i thought simple trig, t=1.66x10^-9
but now completely stuck... coz i think i need the x value... but no idea how to find it? can anyone help?