- #1

Richie Smash

- 293

- 15

## Homework Statement

Hello, I will post a picture below.

An optical device consists of two glass blocks of different indices of refraction, arranged as shown in the picture. The refractive index from air to medium 1 is 1.2, and the refractive index from medium 1 to medium 2 is 1.25

If light is incident on the block with the smaller refractive index at 60°, determine the angles θ1,θ2,θ3,θ4 and θ5.

## Homework Equations

Sin(i)/Sin(r) =

_{1}n

_{2}

## The Attempt at a Solution

Hello, I have figured out theta 1, by using the fact that sin60°/sinθ2= 1.2, from there I rearranged the formula to find theta 1 which is 46.2°.

From there I found theta 2 using alternate angle rule, so from there I found theta 3 using the same concept

: Sin46.2°/sinθ4 =1.25

so theta 3 = 35.3°

So from here once again i found theta 4 using the alternate angle rule, now I'm stuck trying to find theta 5.

I would have done the same thing sin35.3°/sinθ5=??

The problem is i don't know the refractive index of medium 2 to air, i only know the two refractive indices they gave me.

But would the refractive index of medium 2 to air be the same as from medium 1 to medium 2? I can figure it out immediately I'm just not sure what obvious sign I'm clearly missing.