502 Homework 2010 Set 13

# 502 Homework 2010 Set 13 - OPTI-502 Optical Design and...

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Optical Design and Instrumentation I John E. Greivenkamp Homework Set 13 Fall, 2010 Assigned: After Thanksgiving Due: 12/7/10 Lecture 29 Final Exam: Thursday 12/16/10 8:00-10:00 Distance Students: All course materials must be returned to Tucson by Tuesday December 21, 2010 . You may schedule your final exam with your proctor as required by your schedule. 13-1) An Epidiascope or Opaque Projector is used to project the words or images on a piece of paper onto a screen. It is similar to an overhead projector except that it is used for diffuse objects. Design an opaque projector: Paper: 8.5 x 11 inch Screen: 2 m x 2 m Distance to the screen: 3 m (from projection lens) Clearly the problem is going to be getting enough light onto the screen for practical viewing. For practical reasons, the projection lens is limited to a diameter of 8 inches. The desired screen luminance is 2.0 cd/ft 2 (candela/ft 2 ) for white areas on the paper. If each light bulb used to illuminate the paper produces an illuminance of 1000 ft-cds, how many light bulbs are needed? Note any assumptions you make. 13-2) How parallel must the surfaces of a plane parallel plate be in order for the ray deviation through the plate to be less than 1 arc min? Assume n = 1.5. 13-3) Design an achromatic prism producing a deviation of 30 arc min using BK7 and F2 glasses. Determine the magnitude of the secondary dispersion. Compare this secondary dispersion value to the dispersion of simple wedge of BK7 producing the same deviation. BK7

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## This note was uploaded on 12/17/2010 for the course OPTI 502 taught by Professor Greivenkamp during the Fall '08 term at University of Arizona- Tucson.

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502 Homework 2010 Set 13 - OPTI-502 Optical Design and...

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