Find Angle of Refraction: Snell's Law Solution

[IBNU1]

Homework Statement

I need to find how a ray of light will travel from the snail towards Andrews eye.
I need to find the angle of incidence and angle of refraction.
I know the index of refraction of both materials
Air: 1
Water 1.33

Homework Equations

Snells law
1.33 *sin(X) = sin(y)
x is angle of incidence
y is angle of refraction

The Attempt at a Solution

I only know how to solve these problems when I have a normal line
How do I find the normal line[/B]

 

[SammyS]

Homework Statement

[ IMG]https://lh5.googleusercontent.com/E...lcg_XBTdwS863jFltmT7FF4b_iHfnRVnKXNREgjMZyCGo[/PLAIN]

I need to find how a ray of light will travel from the snail towards Andrews eye.
I need to find the angle of incidence and angle of refraction.
I know the index of refraction of both materials
Air: 1
Water 1.33

Homework Equations

Snells law
1.33 *sin(X) = sin(y)
x is angle of incidence
y is angle of refraction

The Attempt at a Solution

I only know how to solve these problems when I have a normal line
How do I find the normal line

Hello IBNU1. Welcome to PF .

Do you have any dimensions for this ?

 

[IBNU1]

Hello IBNU1. Welcome to PF .

Do you have any dimensions for this ?

Sorry I forgot to include them
The depth of the water is 5m and the distance from his eye to the snail is 25 m

 

[SammyS]

Sorry I forgot to include them
The depth of the water is 5m and the distance from his eye to the snail is 25 m

I seems to me that you need to know more than that.