rev25sp09 - April 21, 2009 PHY 2054 Discussion Spring 09...

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April 21, 2009 PHY 2054 Discussion Spring ‘09 Conceptual Review: Chapter 25 A . Cameras 1. Relate f-number with the intensity of light. B. Corrective Lenses 1. A lens with a power of 2.0 diopters is in contact with a lens of -0.50 diopters. What is the power of the combined lenses? 2. A person has a far point of 50 cm. What is the power of the contact lens required to correct the patient vision? What is the power of the required glasses if the glasses are 1.0 cm away from the eyes? C. Simple Magnifier 1. Why is the angular magnification useful as long as eyes are concerned? 2. What are the range of object distance to see an enlarged image with a magnifying lens and the corresponding magnifications? 1. A microscope has two interchangeable objectives of focal lengths 2.0 cm and 0.4 cm. It also has two eyepieces of focal length 2.5 cm and 5.0 cm. The objective and the eyepiece are separated by 20 cm. Find the maximum & minimum magnification. 2. In a telescope/microscope, the image formed by an objective lens is located near the focal point of the
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This note was uploaded on 12/13/2011 for the course PHY 2054 taught by Professor Avery during the Fall '08 term at University of Florida.

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rev25sp09 - April 21, 2009 PHY 2054 Discussion Spring 09...

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