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MIT2_71S09_practice1

# MIT2_71S09_practice1 - of a thin positive lens of power...

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2.71/2.710 Optics Practice Exam 1 Spring ‘09 1. Consider the two-lens system shown below. Lens L1 has focal length f , and lens L2 has focal length f/ 2. (a) Set the separation distance d such that the Effective Focal Length (EFL) of the combination equals f . (b) Locate the principal planes. (c) Locate the image plane. (d) What are the lateral and angular magnifications? 2. It is found that sunlight is focused to a spot 29.6 cm from the back face of a thick lens, which has principal planes P 1 at +0.2 cm to the front face and P 2 at -0.4 cm to the back face. Determine the location of the image of a candle that is placed 49.8 cm in front of the lens. 3. Show that one of the principle planes of a plano-convex or plano-concave lens is tan- gential to the curved surface. 4. A compound lens consists

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Unformatted text preview: of a thin positive lens of power +2.5D followed by an interval of 20 cm followed by a thin negative lens of power-2.5D. Locate the principal planes and determine the EFL, BFL, and FFL. 5. An object is placed 200 cm to the left of the ±rst lens of problem 4. Where does the image form and what is the lateral magni±cation? 1 MIT OpenCourseWare http://ocw.mit.edu 2.71 / 2.710 Optics Spring 2009 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms ....
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MIT2_71S09_practice1 - of a thin positive lens of power...

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