12.07.2015 Views

Lab#30H (Reflection of Light)

Lab#30H (Reflection of Light)

Lab#30H (Reflection of Light)

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6. Move the pin from R2 to location R3. Getting down on eye level, line up pins R3 and P’. Placepin L3 close to the mirror in line with R3 and P’. Remove pins R3 and L3. Use a ruler to connectthe holes left by the pins.7. Remove the mirror and pins from the paper.8. Extend each <strong>of</strong> the lines representing the reflected rays to the line XY and then beyond untilthey intersect. If all three rays intersect at a point then they were drawn accurately. If they donot intersect, you will need to start over.• Verify with your teacher whether your diagram is acceptable or not.9. Label the points where the reflected rays cross the line XY as A, B and C. (See diagram on page 1for help.)10. Draw lines PA, PB, and PC. (Connect point P to points A, B and C.)These are the paths <strong>of</strong> the incident rays corresponding to thethree reflected rays.11. At A, B and C, draw the normals to XY as dotted lines thatextend in front <strong>of</strong> the “mirror”, not behind. (Remember normallines are drawn perpendicularly.)12. Now, measure the angle <strong>of</strong> incidence and reflection to thenearest tenth <strong>of</strong> a degree. Record your data in the tablebelow.13. Calculate the difference between the two angles.14. Attach your diagram to this lab. (40 pts)XθrAθiR1 NormalP’ (Image <strong>of</strong> Pin)YP (Pin)Data Collection(20 pts)Incident RayIncident Angle(deg)Reflected Angle(deg)Difference inAngles (deg)PAPBPCUncertainty ± ___________ ± ___________Post-Lab Questions Answer the following questions in the space below. If you need more room use aseparate piece <strong>of</strong> paper. Show all work!1. Look at the difference in angles in the data table. Does your data verify the law <strong>of</strong> reflectionwithin the limits <strong>of</strong> experimental error (± 3 o )? Explain.(5 pts)__________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________2

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