Carhart, Henry S. (Henry Smith), 1844-1920 · Boston : Allyn and Bacon · leaf 291
and the distance betweenthe object and the screen 100 cms. Where must the lens be placedto give a clear image ? 3. The focal length of a glass lens in air is 80 cms. If the indicesof refraction of glass and water are | and | respectively, what is thefocal length of the lens in water ? 2O2.… … Fig. 140. 0 is the optical centre. First draw secondary axes A 0and BO. Since these pass through the optical centre, therays along them undergo no deviation. Next draw ADand BH parallel to the principal axis JfO, which passesthrough the centres of curvature (7, (7, and the optical centre.These rays…
Physics
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