Optical Instruments

# Optical Instruments - Optical Instruments Report Class...

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Optical Instruments Report Class: Physics 182 Lab Summer II TA: Joy Ding Date of Experiment: 8/02/10 Due Date: 8/04/10 Itzel Rodriguez Goal of Experiment: The purpose of this lab is to learn how to obtain the focal length of two different lenses using the thin lens equation as well as light rays. While finding the focal length, diagrams of the

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system must be created to show an understating of it. Also, this lab was used to see angular magnification works as well as making two different kinds of telescopes. Introduction: When two lenses are set-up together the total focal length also known as the effective focal length can be found easily by using the thin lens equation = ( ) - i2 o2 f2o2 f2 where it relates = - o2 d i1 . It is important to know that it is not enough to just use the thin lens equation for the two lenses because the light going into the second lens aren’t parallel like in the first lens so this causes difficulties with the thin lens equation. The magnification for 3D lenses can be obtained through the equation = - M i1o1 for each individual lens which can then give the total magnification = Mtotal M1M2 or in other terms = M hi2ho1 where hi2 is is the height of the final image produced and ho1 is the height of the original object. Besides magnification 3D lenses can have angular magnification. This means that objects that are close compared to objects that are further away are bigger because of the bigger angle. Angular magnification was a near point and that is where an object is as close as it can get before getting out of focus. Combining lenses is useful when creating and talking about telescopes. When looking at Keplerian telescopes it’s good to know that the distance between the lenses is the sum of the two focal lengths as in equation = + . d f1 f2 Also, the ratio of the focal length is the angular magnification =- Mang f1f2 . The main difference between a Keplerian Telescope and a Galilean Telescope is that a Keplerian telescope consists of two converging lenses while the other one has one converging lens and one diverging lens. Procedure:
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## This note was uploaded on 09/13/2010 for the course PHYS 182 taught by Professor Greg during the Summer '08 term at Arizona.

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Optical Instruments - Optical Instruments Report Class...

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