Earth and space sciences

1.What is the objective of this assignment?

2.Explain total internal reflection. Under what conditions does it take place?

3.Start Applet 1. Select incident ray in Larger n region and set nupper equal to 1.00. This is a case where a light ray goes from a higher index medium into a lower index medium.

4.In this step, you will change the values of the angle of incidence ?1 and record the values of the angle of refraction ?2. In each of the three cases below, record data until the angle ?2 reaches 90 degrees (after 90 degrees there is no more refraction).
a.Set nlower equal to 1.10. Set the angle of incidence ?1 to 10, 20, 30, 40, 46, 50, 56, 60, and 65 degrees. Each time you set the value of ?1, record the value of the angle of refraction ?2.

b.Set nlower equal to 1.20. Set the angle of incidence ?1 to 10, 20, 30, 40, 46, 50, 56, 60, and 65 degrees. Each time you set the value of ?1, record the value of the angle of refraction ?2.

c.Set nlower equal to 1.40. Set the angle of incidence ?1 to 10, 20, 30, 40, 46, 50, 56, 60, and 65 degrees. Each time you set the value of ?1, record the value of the angle of refraction ?2.

5.On the same spreadsheet, input the data from question 4 as follows:
The values of ?1 in the first column. The values of ?2 for nlower = 1.10 in the second column. The values of ?2 for nlower = 1.20 in the third column. The values of ?2 for nlower = 1.40 in the fourth column. Plot the values of ?2 vs. ?1. You should have three curves on your plot.

6.What type of curves do you get? How does ?2 vary as ?1 increases?
Can you determine the critical angle from the curves?

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