In a darkened room, a burning candle is placed 1.50 m from a white wall. A lens is placed between the candle and the wall at a location that causes a larger, inverted image to form on the wall. When the lens is in this position, the object distance is p1. When the lens is moved 90.0 cm toward the wall, another image of the candle is formed on the wall. From this information,we wish to find p1 and the focal length of the lens. (a) From the lens equation for the first position of the lens, write an equation relating the focal length f of the lens to the object distance p1, with no other variables in the equation. (b) From the lens equation for the second position ofthe lens, write another equation relating the focal length f of the lens to the object distance p1. (c) Solve the equations in parts (a) and (b) simultaneously to find p1. (d) Use the value in part (c) to find the focal length f of the lens.

College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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In a darkened room, a burning candle is placed 1.50 m from a white wall. A lens is placed between the candle and the wall at a location that causes a larger, inverted image to form on the wall. When the lens is in this position, the object distance is p1. When the lens is moved 90.0 cm toward the wall, another image of the candle is formed on the wall. From this information,
we wish to find p1 and the focal length of the lens. (a) From the lens equation for the first position of the lens, write an equation relating the focal length f of the lens to the object distance p1, with no other variables in the equation. (b) From the lens equation for the second position of
the lens, write another equation relating the focal length f of the lens to the object distance p1. (c) Solve the equations in parts (a) and (b) simultaneously to find p1. (d) Use the value in part (c) to find the focal length f of the lens.

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