1. Example: a 45-45-90 glass (n=1
Example: a 45-45-90 glass (n=1.50) prism is surrounded by water (n=1.33). Light is incident at a 23 angle, as shown in the diagram. What angle does the light make when it exits the prism?
45
ng=1.50
45
nw=1.33 i

2. keep an extra digit to reduce roundoff error
Example: a 45-45-90 glass (n=1.50) prism is surrounded by water (n=1.33). Light is incident at a 23 angle, as shown in the diagram. What angle does the light make when it exits the prism?
45
ng=1.50 g
45
keep an extra digit to reduce roundoff error
nw=1.33 i

3. There are a variety of ways to get this.
Example: a 45-45-90 glass (n=1.50) prism is surrounded by water (n=1.33). Light is incident at a 23 angle, as shown in the diagram. What angle does the light make when it exits the prism?
45
Trig…
90  = 69.73
20.27
65.27
180  - 45 = 65.27
69.73
45
90  = 24.73
nw=1.33
There are a variety of ways to get this.
23

4. Example: a 45-45-90 glass (n=1
Example: a 45-45-90 glass (n=1.50) prism is surrounded by water (n=1.33). Light is incident at a 23 angle, as shown in the diagram. What angle does the light make when it exits the prism?
45 
24.73
45
nw=1.33

5. Example: a 45-45-90 glass (n=1
Example: a 45-45-90 glass (n=1.50) prism is surrounded by water (n=1.33). Light is incident at a 23 angle, as shown in the diagram. What angle does the light make when it exits the prism?
45 
24.73
45
nw=1.33