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Unformatted text preview: Lecture 13 9. Optical Systems 9.3 Magnifcation 9.4 Magnifer Glass and other eyepieces 9.5. Microscope 9.6. Telescope 9.3. Magnifcation Defnition oF magnifcation For optical systems In the optical system we are discussing in the Following we are dealing with virtual objects which are real on our retina The angle by which the beams enter the eye needs to be increased such that the image points are Further apart on the retina ! u ! a Magnifcation MP = size on retina with instrument size on retina without = " a " u = y a y u y a y u " u " a 9.3. MagniFying Glass Unaided eye Aided eye " u = y o d o " a = y i L MP = y i d o Ly o And not: y i y o MP = y i d Ly o MP = " s i d Ls o = d o ( ) L 1 " s i f # $ % & = d o ( ) L 1 + 1 f L " l ( ) # $ % & We put lens using very close to the eye: l=0 In order to have a comfortable observation L=25cm MP = 25 cm [ ] f cm [ ] + 1 = 0.25 D + 1 For L = " MP = d o cm [ ] f cm [ ] = d o D In our experiment 25cm MP = s i s o = 1 " s i f = 1...
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- Fall '04