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 63
, m=± (I) PQ p V If a line perpendicular to PP be erected at C to meet the rayQD, we will have pQ f (3)(4) PQ f- -/ From (1) and (2) f~f=P\ f f 1 1 1 which is the formula required. 52 EXPERIMENTAL PHYSICS. It will be seen, in this case, that the image is always virtual,and so cannot be measured… … Fig- 41. permit two pencils of light PE and PF to pass through the lens,and to form two bright spots, G and H, on a screen placedbehind it. As these pencils on issuing from the lens appearto come from the point P, it is therefore the image of P. From similar triangles, GHP and EFP, we have…
Physics
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