UMass Amherst PHYSICS 132 - Physics 132 Lab 3 - Human Eye (6 pages)
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Physics 132 Lab 3 - Human Eye
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- Pages:
- 6
- School:
- University of Massachusetts Amherst
- Course:
- Physics 132 - Intro Physics II
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Unformatted text preview:
Physics 132 Lab 3 Geometric Optics and the Human Eye Reflection and Refraction 1 2 Repeat this procedure for a total of 6 sets of angles Record your measurements in the spreadsheet Incident Reflection Refraction 10 11 7 15 15 5 10 5 20 21 13 75 25 25 15 5 30 31 19 35 36 5 22 5 40 41 5 25 5 45 46 28 Measure the size of the image on the screen with a ruler and record in the spreadsheet Lenses Image Object Distance Distance 3 4 O 1 do I 1 di Image Size cm 20 19 0 05 0 05263157895 4 19 19 5 0 05263157895 0 05128205128 4 3 18 20 5 0 05555555556 0 0487804878 4 8 17 21 7 0 05882352941 0 04608294931 5 3 16 23 9 0 0625 0 04184100418 6 3 15 26 7 0 06666666667 0 03745318352 7 8 14 31 9 0 07142857143 0 03134796238 10 13 37 5 0 07692307692 0 02666666667 12 7 12 48 5 0 08333333333 0 0206185567 17 4 11 77 5 0 09090909091 0 01290322581 29 2 Place a piece of paper over half the lens What happens to the image The obscured half of the image is out of focus but still visible It appears as if the left half is obscured when in fact the right half is If the top half of the object is covered it appears that the bottom half of the image is covered This is because the image is inverted Is the image upside down or right side up The image is upside down because the converging lens refracts the rays so that the image is inverted 5 6 Repeat this procedure of measuring object and image distance in spreadsheet Move the lens closer to the light box in 1 cm steps until you can no longer form an image on the screen What is the distance between the object light box and the lens when you can no longer form an image on the screen At 8 cm the image no longer appears on the screen The image distance would be 48 cm The image would be virtual because the object is less than the focal length away from the lense meaning the light rays would converge on the same side of the lense as the object Law of Reflection 7 Make a graph of the angle of reflection vs angle of incident What pattern would you describe
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