- 376

- 0

**1. 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?

**2. Homework Equations**

t(x)=xtan(theta)

2nt=m*lamda (m+.5) for deconstructive

x=(lamda/2)/2n*tan(theta)

t=lamda/2n

**3. The Attempt at a Solution**

ok im 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?