lab about reflection and has questions.

Description

This week, you will use the PheT simulations to study reflection and refraction.  This will be an online lab instead of an eScience lab.  You will use this website:
https://phet.colorado.edu/sims/html/bending-light/latest/bending-light_en.htmlLab 9: Reflection and Refraction Lab:
1. Use the PheT simulation found at:
https://phet.colorado.edu/sims/html/bending-light/latest/bending-light_en.html
2. Select the simulation labeled “Intro.”
3. Select “Ray” in the upper left corner. Set the top medium to “Air” and the bottom medium to
“water”. Use the Protractor tool to measure the angles of the incident and reflected rays. Change the
position of the source, and repeat for 5 different incident angles. Record your results in the first two
rows of the table below:
Incident Angle
Reflected Angle
Refracted Angle
(water)
Refracted
Angle
(glass)
Refracted
Angle (air
with n =
1.15)
Refracted
Angle (air
with n =
1.25)
1.
2.
3.
4.
5.
4. What do you notice about the incident and reflected angles in your table?
5. State the Law of Reflection here. Does your data support this law? Why or Why not?
6. Now we will investigate refraction. Using the protractor tool, complete column 3 of the table by
measuring the refracted angle for each of the incident angles you chose. What happens to the refracted
angle as the incident angle changes?
7. Change the bottom material to “glass” and complete column 4 of the table by measuring the
refracted angle for each of the incident angles you chose. What happens to the refracted angle as the
incident angle changes?
8. Reset the bottom material to “water” and increase the index of refraction for the top material so that
it is 1.15. Complete column 5 of the table by measuring the refracted angle for each of the incident
angles you chose. What happens to the refracted angle as the incident angle changes?
9. Reset the bottom material to “water” and increase the index of refraction for the top material so that
it is 1.25. Complete column 5 of the table by measuring the refracted angle for each of the incident
angles you chose. What happens to the refracted angle as the incident angle changes?
10. State Snell’s law of refraction. For your initial angle of incidence (row 1 in the table), calculate the
refracted angle for each of the situations in columns 3 – 6 of the table. Record your calculations below.
Do your calculated results match the angles you measured above?
Incident Angle
Calculated angle water
Calculated angle glass
Calculated angle
(n = 1.15)
11. Summarize what you have learned by doing this lab (300 words minimum).
Calculated angle
(n = 1.25)

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