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# Midterm - different in color usually black and white...

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Midterm Phys 352 Name:  1. (10pts) You have two lasers that can be changed in power: (1) Argon Laser  (490nm) and a (2)  Krypton laser  (650nm). a. Determine the color code of a combination of 400mW from the Argon  Laser and the 200mW from the Krypton laser. b. Can you combine the two lasers to obtain a color code of  i. x=0.403, y=0.284 ii. x=0.284, y=0.403 iii. x=0.245, y=0.345 iv. x=0.245, y=0.289 v. x=0.005, y=0.296 (each proper answer +1, each wrong answer, -1, minimum 0pts. so do not  just guess)

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2. (10pts) You have all seen (I hope) these light mills that start to rotate when you  illuminate them with light from the side. Neglecting thermal effects, describe why  this works. Why is it important that the two sides of the wings of the mill are

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Unformatted text preview: different in color, usually black and white? QuickTimeª and TIFF (Uncompressed) are needed to see t Fig. 1 3. (10pts) Describe in words and sketches why in a regularly ordered perfect crystal no light is scattered to the side and back. 4. (30pts) For the arrangement of lenses and mirrors in Fig. 2 find the final image position and size using a. Ray diagrams b. Calculations using the lens equations c. Calculations using the matrix method. d. Using the matrix method, calculate how the distance between the lenses would have to be changed such that the image is at the same position as the object. Confirm your result through “intuitive” arguments. 5. (5pts) Where do the two beams in Fig. 3 intersect? FP FP...
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