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14 - Optical Instruments

# 14 - Optical Instruments - Physics 8B 14 Optical...

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Physics 8B 14 – Optical Instruments rev 4.0 14 – Optical Instruments 1. A 12 cm tall candle is at x = 0 cm. There is a lens, f 1 = +10 cm, at x = 30 cm. There is another lens, f 2 = +6 cm located at x = 60 cm. ( NOTE: Axes for ray tracing provided on next page) a) For the first lens i) P: What is the object distance? ii) P: What are the image distance and x-location of the image #1? iii) P: What is the magnification of image #1 (relative to object #1)? iv) Q: Draw a qualitatively accurate ray tracing diagram for lens #1. v) Q: Why can you use image #1 as the object #2 for the second lens? (Hint : Does the light stop when it reaches the location of the first image?) b) For the second lens i) P: What is the object distance? ii) P: What are the image distance and x-location of the image #2? iii) P: What is the magnification of image #2 (relative to object #2)? iv) Q: Draw a qualitatively accurate ray tracing diagram for lens #2. c) For the combined two-lens system i) P: What is the x-location of the final image for the two-lens system? ii) P: What is the overall magnification of the two-lens system? iii) P: What is the height and orientation of the final image relative to the original object?

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