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Draw a neat labelled diagram of image formed in a refracting telescope. Give the expression for magnification of an object, for an image formed at infinity. |
Answer» SOLUTION : Here, `L=f_(0)+f_(e)`. `tan alpha= -(h)/(f_(0))=alpha` for small angles. `tan beta= (h)/(f_(e))= beta` for small angles. and`m= (beta)/(alpha) = - (f_(0))/(f_(e))`. The -ve sign indicates that the FINAL IMAGE is inverted. Note : The largest lens objective in USE has a diameter of 40 inches, which is at the Yerkes observatory in Wisconsin, USA. |
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