3. An optical system consists of two lenses. If the focal length of the first lens is ??1=10 cm and the focal length of eyepiece is ??2=15 ????. The distance between two lenses is 20cm. An object is 15 cm away from the first lens.
(a) Please find the location of final image from the second lens.
(b) Is the final image behind or in front of second lens?
(c) Is this an erect or inverted image?
(d) Is this a real or virtual image?
(e) What is the magnification of final image?
4. A microscope consists of an objective lens and an eyepiece. The distance between the objective and the eyepiece is ??=23 ????.
(a) If the magnification power of eyepiece is 10X, what is the focal length of eyepiece?
(b) If the required total magnification power is -500x, what is the required focal length of objective?
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