S10P1CLec23B

# S10P1CLec23B - Physics 1C Lecture 23B "You are the...

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Unformatted text preview: Physics 1C Lecture 23B "You are the lens in the beam. You can only receive, give, and possess the light as the lens does. If you seek yourself, you rob the lens of its transparency. You will know life and be acknowledged by it according to your degree of transparency, your capacity, that is, to vanish as an end, and remain purely as a means."--Dag Hammarskjold From Last Time A lens produces a sharply focused, inverted image on a screen. What will you see if the top half of the lens is covered? screen D) The image will be much dimmer but otherwise unchanged. Note that the three principal rays that all come from the top point of the arrow. Also note that two of the rays are blocked and the third hits the screen. We should also not forget that there are millions of actual rays. Thin Lens Equation The lateral magnifcation, M, oF the image height compared to the object height can also be Found geometrically. This gives us the Following relationship: where the negative sign comes From the Fact that h is inverted with respect to h. M = h h = q p Ray Diagrams The most important thing to remember when dealing with the lens equations is to remember the sign conventions. Focal Length for a Lens When constructing a lens the geometry of the material and kind of material used must be taken into account. The focal length, f, of a lens is related to the curvature of its front and back surfaces and the index of refraction, n, of the material: where R 1 is the radius of curvature of the near...
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## This note was uploaded on 06/03/2010 for the course PHYS PHYS 1C taught by Professor F during the Spring '00 term at UCSD.

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S10P1CLec23B - Physics 1C Lecture 23B "You are the...

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