Gregg, J. B. [from old catalog] · Ada, Ohio, The University herald press · leaf 81
ngle the refracted light makes with thenormal; (3.) S;, the sign of the incident angle; (4.) Sr, thesign of the refracted angle; (5.) /, the index of refraction. LIGHT. EXPERIMENT 32. FOCAL LENGTHS. Arrange Method*—1. Of Double Convex Lens. Arrange a screen,lens, and cross wires as shown in the… … Apparatus. position for the lens that will give a sharply defined image. 2. Of Concave Mirror. Place a piece of white paper inthe eye of a needle, and use it as an object. Start some dis-tance from the mirror and bring the needle up until theimage of the paper and the paper itself do not…
Physics
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