vex lenses. EXPERIMENT 19. To verify the, relation between the positionsof an object and its image formed by a convex lens ; to determinethe focal length of the lens and to find its magnifying power. In making the observations we may use the optical benchshewn in fig. 11, the lens will take the… … Fig. 97. A substantial wooden block rests on the table and carries anarm which can rotate about a screw through one end. Thelens, held in a metal or ebonite frame, is secured to a secondarm attached to this by another screw, and is thus capable ofvarious adjustments. The lens will come between the…
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