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**Refractive Index Problem invloving prism (Please Help)**

**1. Homework Statement**

What is given is a prism, angle of deviation and apex angle, I also have to find refractive index of the prism.

To solve the problem I must prove that:

Nprism = sin((A+d)/2)/ sin(A/2)

**The diagram given of the Prism:**

http://img80.imageshack.us/img80/5148/trianglepv4.png [Broken]

**2. Homework Equations**

n sin(i) = nprism sin (r)

**3. My attempt at a solution**

nprism = sin(i1)/sin(r1)

therefore i1 = (A+d)/2 and r1 = (A/2)

just need to figure i1 = (A+d)/2 and r1 = (A/2) by proving

**Please Note:**My solution so far may be completely wrong, any help given would be very much appreciated :)

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