Physics 1302, Fall 2007, Prof. J. Miller: Sample Problems #3 1. A nearsighted person cannot see objects clearly beyond 60 cm from her eyes. Which combination represents the correct focal length and refractive power of contact lenses that will enable her to see distant objects clearly? Answer: -60 cm, -1.67 diopters. 2. The focal lengths of the objective and eyepiece in a compound microscope are 0.50 cm and 2.50 cm, respectively. An object is placed at a distance of 0.52 cm from the objective. If the near point of the eye is 25.0 cm, what is the total magnification of the microscope? Answer: -260. 3. The focal length of the lens of a simple camera is 50 mm. How far must the lens be moved to change the focus of the camera from a person 30 m away to one that is 5.0 m away? Answer: 0.4 mm. 4. In a double-slit interference experiment, monochromatic light of wavelength 550 nm passes through a pair of slits separated by 2.5 x 10-5 m. What is the angle corresponding to the third dark fringe? Answer:
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