## thibui Group Title A light ray travels from water (n = 1.33) to crown glass (n = 1.52) and bends at a 30º angle to the normal. What is the incident angle for the light from the water? Answer with three significant digits. **I tried Snell's Law and no matter what I do, I didn't get the correct answer, help me :( 4 months ago 4 months ago

1. theEric Group Title

It seems like you have all the information for Snell's Law!|dw:1397869962800:dw| $$n_w\sin\theta_w=n_g\sin\theta_g$$ $$\implies \theta_w=\arcsin\left(\dfrac{n_g\sin\theta_g}{n_w}\right)$$

2. theEric Group Title

|dw:1397870541728:dw| That doesn't seem too bad :) What are you getting?

3. theEric Group Title

Good luck! If you're using a calculator, make sure you have it set to degrees!