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# Lab2(1) - Geometric Optics Lenses 1 Introduction In this...

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Geometric Optics: Lenses 1 Introduction In this experiment, we will continue to explore geometrical optics by studying the optics of simple curved mirrors and lenses. 2 Background - see Pedrotti 3 , Sections 2-6 to 2-9 When studying the geometrical optics of mirrors or lenses one considers the following three quantities: object distance 𝑠 𝑜 , image distance 𝑠 𝑖 , and focal length 𝑓 . These quantities are related by the equation 1 𝑠 𝑜 + 1 𝑠 𝑖 = 1 𝑓 (1) There is a convention to be followed in the definition of these quantities. For lenses, a converging lens (convex) has 𝑓 > 0 while a diverging lens (concave) has 𝑓 < 0. For mirrors, 𝑓 > 0 for concave mirrors, and 𝑓 < 0 for convex mirrors. Also by convention, we place the object to the left of the lens, with 𝑠 𝑜 > 0. If 𝑠 𝑖 > 0, it is on the right of the lens and is a real image. If 𝑠 𝑖 < 0 it is to the left of the lens (same side as object) and is a virtual image. One can consider the mirror as a folded over version of the lens:

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