EXPERIMENT 5 - Anil Kanungo (ASK 358) Partners: Kelvin Lo,...

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Anil Kanungo (ASK 358) Partners: Kelvin Lo, Travis Hutchins PHY 115L 60675 October 9, 2008 Page 1 of 6 EXPERIMENT 5 – Thin Lens (Part I) [Observations]: 1) Rays will refract upon entering any medium. However, if the rays enter a lens directly through its optical axis (the center for our particular lens), then the rays will continue on a straight path. 2) [Experiment 1]: 1) In the figure above, the ray at Position 1 is on the optical axis . Since the cardboard screen was initially placed past the focal length, when we moved the laser higher to Position 2, the beam was refracted to a lower position on the cardboard. Conversely, when we moved the beam lower to Position 3, the beam was refracted to a higher position on the cardboard. 2) From the figure above, we also see that there is a focal length which lies at a point where all rays converge. When the screen was placed at this length, raising and lowering the laser did not affect the position of the point on the cardboard ( see below ).
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Anil Kanungo (ASK 358) Partners: Kelvin Lo, Travis Hutchins PHY 115L 60675 October 9, 2008 Page 2 of 6 3) After reversing lens orientation: Notice the focal length becomes closer to the lens. 4) When ray enters from an angle through focal point and around focal point: When a ray enters at an angle through focal point, it leaves perpendicular to the lens and will be oriented horizontally. When the ray enters at this same angle
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EXPERIMENT 5 - Anil Kanungo (ASK 358) Partners: Kelvin Lo,...

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