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Unformatted text preview: Solution for Homework 24 Curved Interfaces (Required by Not Collected) Solution to Homework Problem 24.1(Maxwell and Coulomb) Problem: Which of Maxwells equations is most closely related to Coulombs law? Select One of the Following: (aAnswer) Gauss Law (b) No magnetic Monopoles (c) Faradays Law (d) Amperes Law (e) Toby. Solution (a) Gauss law related charge to electric field, just as Coulombs law. Total Points for Problem: 3 Points Solution to Homework Problem 24.2(Lab Telescope) Problem: One of the lab lenses used for activity 27 has focal length 20cm . (a)Calculate the magnifying power of this lens used as a simple magnifer. (b)The shortest lens in lab has a focal length of 5cm . Calculate the magnifying power of a telescope using the 20cm lens as the objective and the 5cm lens as the eyepiece. (c)How far apart should the lenses be placed to form a telescope? Solution to Part (a) The magnifying power of the a simple lens is calculated when the image forms at infinity. The magnifying power of a simple lens is given by MP = np f = 25cm 20cm = 1 . 25 Grading Key: Part (a) 2 Points Solution to Part (b) The magnifying power of a telescope if the ratio of the focal lengths MP = f o f e = 20cm 5cm = 4 Grading Key: Part (b) 2 Points Solution to Part (c) The lenses must be placed so their focal points coincide, so the distance between lenses must be d = 20cm+5cm = 25cm . Grading Key: Part (c) 2 Points 1 Total Points for Problem: 6 Points Solution to Homework Problem 24.3(Lab Microscope) Problem: We can build a compound microscope using the two 5cm lenses from lab. We will use the standard tube length of L = 16cm . (a)Calculate the magnifying power of a 5cm lens used as a microscope objective. (b)Calculate the magnifying power of a 5cm lens used as a microscope eyepiece. (c)Calculate the total power of the microscope. (d)Approximately how far apart should the lenses be placed. Solution to Part (a) The magnifying power of the objective MP objective = parenleftbigg L f o parenrightbigg = parenleftbigg 16cm 5cm parenrightbigg = 3 . 2 Grading Key: Part (a) 2 Points Solution to Part (b) The magnifying power of the eyepiece is the magnifying power of a simple magnifier MP eyepiece = np /f e = 25cm / 5cm = 5 . Grading Key: Part (b) 2 Points Solution to Part (c) The total magnifying power is the product of the power of the two lenses, MP = 3 . 2 5 = 16 . Grading Key: Part (c) 2 Points Solution to Part (d) The lenses should be placed the two focal lengths plus the tube length apart d = 5cm + 16cm + 5cm = 26cm . Grading Key: Part (d) 2 Points Total Points for Problem: 8 Points Solution to Homework Problem 24.4(Intensity of Laser Beam) Problem: Club Lavella claims to be the Worlds largest Beach Club. Neil says it has a 5W laser to run its light show. Assume the laser creates a 1cm radius beam....
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 Spring '08
 Stewart
 Physics, Work

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