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Given two 12-cm-focal-length lenses, you attempt to make a crude microscope using them. While holding these lenses a distance 55 cm apart, you position your microscope so that its objective lens is distance dofrom a small object. Assume your eye's near point N = 25 cm. (a) For your microscope to function properly, what should dobe? (b) Assuming your eye is relaxed when using it, what magnification M does your microscope achieve? (c) Since the length of your microscope is not much greater than the focal lengths of its lenses, the approximation M ~ NUf* fois not valid. If you apply this approximation to your microscope, what % error do you make in your microscope's true magnification?
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Chapter 25 Solutions
Physics: Principles with Applications, Books a la Carte Edition & Modified Mastering Physics with Pearson eText -- ValuePack Access Card Package
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- One strain of bacteria was found to have a membrane potential of -120 mVmV at a pHpH of 7.5. A bacterium can be modeled as a 1.5-μmμm-diameter sphere. How many positive ions are needed on the exterior surface to establish this membrane potential? (There are an equal number of negative ions on the interior surface.) Assume that the membrane properties are the same as those of mammalian cells.arrow_forwardQ: Draw the fabrication layers of a transistor with metal and semiconductor MS junction (Schottkyj unction).arrow_forwardphysicsarrow_forward
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