Physics 52 Prof Test 1s-key

Physics 52 Prof Test 1s-key - magnification of the image...

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Physics 52 Proficiency Test 1(Sample) (Time: 15 minutes) 25 points By Todd Sauke Name ________ KEY _____________ Section # __ KEY ___ Consider a compound microscope, constructed from two lenses, the first (eyepiece) of focal length f e = 3 cm and the second (objective) of focal length f o = 1 cm. The lenses are supported by a tube and fixed to have a separation of 10 cm as shown below. An object is to be placed to the left of the objective lens and viewed by eye to the right of the eyepiece. The eyepiece acts as a simple magnifier for the image of the object to be formed just to the left of the eyepiece (inside the tube). For comfortable viewing, the image should be one focal length to the left of the eyepiece, so that the image formed by the eyepiece is at infinity (appropriate for a relaxed eye). Your jobs are to: (1) determine where the object should be placed (at what distance to the left of the objective lens); (2) sketch the ray diagram showing image formation of the object inside the tube; (3) identify the nature, orientation, and
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Unformatted text preview: magnification of the image inside the tube; (4) determine the overall angular magnification of the final image, as compared to the original object if viewed at a typical near point of 25 cm. 1/f = 1/d + 1/(10-f e ) ; solve for d = 1.167 cm (1) How far to the left of the objective lens should the object be placed? __ 1.167 ___cm (2) Sketch the ray diagram, using several principle rays, showing the image in the tube. ____________ (3) Is the image in the tube ( REAL ) or VIRTUAL ? (circle one) ___________ Is the image in the tube ERECT or ( INVERTED ) ? (circle one) m = - s' / s = - (10-3) / 1.167 = -6 What is the magnification of the image in the tube? ____-6 _________ M = m 25 / fe = -6* 25 / 3 = -50 (4) What is the overall angular magnification of the final image, as compared to the original object if viewed at a typical near point of 25 cm? ______-50 ___________...
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