502 F08 Final - Solutions

502 F08 Final - Solutions - OPTI-502 Final Exam - In Class...

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OPTI-502 Final Exam - In Class John E. Greivenkamp Page lll3 Fall, 2008 Name SOLUTIONS Closed book; closed notes. The time limit is 2 hours. Equation sheets are attached and can be removed. Spare raytrace forms are also attached. Use the back sides if required. Do not use any pre-stored information or programs in your calculator. Assume thin lenses in air if not specified. If a method of solution is specified in the problerry it must be used. You must show your work and/or method of solution in order to receive credit or partial credit for your answer. Distance Students: Please return the original exam only; do not scan/FA)Vemail an additional copy. l) (10 points) The following list identifies six optical glasses by their six-digit glass code. Identify which ofthese glasses is a crown (K) or a flint (F) bV circling the appropriate letter. Crown Glass: Abbe Number > 50-55 Flint Glass: Abbe Number < 50-55 5s263s @ F v:63.5 664360 K v:36.0 s89613 v:61.3 548458 v:45.8 .á\ s17642 (9 v:64.2 606437 v:43.7 Which ofthese two glasses should be to produce a first-order achromatic doublet with the least excess power? The least excess power results when the dffirence in the Abbe numbers of the two glasses is greatest. Crown Glass: 517642 Flint Glass: 664360
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oPTr-502 Final Exam - In Class John E. Greivenkamp PageZll3 Fall,2008 2) (20 points) During the semester, we have discussed a variety of optical systems, components and concepts. For each of the topics that is listed, provide a brief description and discuss some ofthe features or properties ofthis itern (for example, from a design perspective, what does it mean for the performance of the system or the use of the system?). Try to be practical I am looking for concepts not equations. Limit your answers to the space provided. Legibility does count I need to be able to read it! a) Field Lenses Placed at or near an íntermediate image plane. Bend the bundles of light corresponding to offaxis object points back ínto the optícal system to increase thefield of view or to reduce vígnetting. Do not change the system magnifi.cation or magnifying power. Shíft the exit pupíl location to reduce the eye relief in visual instruments. Since there are located in ímage planes, afield lens must be of high optical quality and free of scratches and dirt. b) Reverse Tele,photo Lens Compound imaging lens or objectíve consisting of a negative lens or groupþllowed by a positive lens or group. The rear principal plane of the system is behínd the system. The backfocal distance is greater than thefocal length. Useful in applications to provide addítíonal working distance. Commonly usedfor systems with shortfocal lengths.
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oPTI-502 Final Exam - In Class Page3ll3 John E. Greivenkamp Fall,2008 c) Right angle Roof Prism (Amici) - Provides a 90 degree beam deviation with no parity change (2 reflections). The extra reflection comesfrom a roof on the hypotenuse of the prism. The use of the roof does not increase
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502 F08 Final - Solutions - OPTI-502 Final Exam - In Class...

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