502 Homework 2010 Set 12

# 502 Homework 2010 Set 12 - OPTI-502 Optical Design and...

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OPTI-502 Optical Design and Instrumentation I John E. Greivenkamp Homework Set 12 Fall, 2010 Assigned: 11/16/10 Lecture 24 Due: 11/23/10 Lecture 26 12-1) A light source is to produce a spot of light on a distant wall. A 250 mm focal length lens with a diameter of 50 mm is to be used. The light emitting source is 4 mm in diameter (consider this to be the diameter of a flat source), and the wall is 25 m away. a) This extended source is “collimated” by placing the source at the front focal point of the lens. What is the total spot size illuminated on the wall? b) The lens is now used to image the source directly onto the wall. What is the resulting source size? c) The source produces a total output power of 10 Watts. Using the imaging configuration of Part b), what is the irradiance on the wall? 12-2) The peephole from the earlier problem was designed to be fully vignetted over a +/- 45 deg FOV. The system specifications were found to be: f1 = -3.83 mm t1 = 25 mm f2 = 28.83 mm Peephole magnification = 0.133 Second element to eye separation = 25 mm Eye pupil diameter = 4 mm Because the second lens was found to have a diameter equal to that of the eye, the peephole was unvignetted only on axis. It has zero unvignetted field of view. Determine the required lens diameters so that the peephole now has some unvignetted field of view with the same fully vignetted field: Fully vignetted field of view of +/- 45 deg Unvignetted field of view of +/- 30 deg

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OPTI-502 Optical Design and Instrumentation I John E. Greivenkamp Homework Set 12 Fall, 2010 12-3) A slide projector is to project a 24 x 36 mm format onto a 1.2 x1.2 m screen at a distance of 10 m. Design a condenser and projection lens system to accomplish this. The light bulb given to you by the project engineer has a filament size of 8.0 x 7.8 mm. Make your design as practical as possible; for example, there must be a spacing between the
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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 Arizona.

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502 Homework 2010 Set 12 - OPTI-502 Optical Design and...

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