A laboratory course in experimental physics (1896)
Loudon, W. J. (William James), McLennan, John Cunningham, joint author · New York and London, Macmillan and Co. · leaf 71
y be taken as a measure of the magnifying power ofthe lens. A number of trials should be made by placing theeye at different distances from the lens, and in order to correctany error arising from a difference in the eyes of the observer,the one should be used as often as the other in viewing each… … oq q? q* Fig. 44. tion increases also, and in order to avoid this, and yet haveconsiderable enlargement, it is customary to use a combination oftwo lenses separated by an interval, for the eyepiece of a micro-scope or telescope. Such a combination is called a doublet,and its magnifying power may be…
Physics
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