1. What is the critical angle for a laser beam travel from air to water?

2- The index of refraction for water is n=1.33. Use this value to calculate the theoretical critical angle for the laser travelling from water to air. Compare this value to the one you experimentally determined with a percent error calculation.

3- Complete Table 3 by computing the sine of the incident and refracted angle.

4- Plot a graph of sin(θ_{i}) versus sin(θ_{r}).

5- Draw in a line of best fit.

__Hint__: You want the y-intercept to be zero.

6- Estimate the slope of the line and compare the slope to the index of refraction for water (n = 1.33) with a percent error calculation. Explain any discrepancies.

7- Do you always observe a reflected ray of light as you increase the incident angle? What happens to the intensity of the reflected light as you increase the incident angle and eventually cross the critical angle?

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