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Answer the following questions: (c) Magnifying power of a simple microscope is inversely proportional to the focal length of the lens. What then stops us from using a convex lens of smaller and smaller focal length and achieving greater and greater magnifying power? |
| Answer» Solution :(C) First, grinding lens of very small focal length is not easy. More important, if you decrease focal length, aberrations (both spherical and chromatic ) become more pronounced. So, in PRACTICE, you cannot get a MAGNIFYING power of more than 3 or so with a simple CONVEX lens. However, using an aberration corrected lens system, one can increase this limit by a FACTOR of 10 or so. | |