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 82
he light to betested, AB the lens, ST the paper disc of the photometer,and CPD a cone of light striking the lens. Let A and A bethe intensities of the standard and of the given light at a unitdistance ; B and B the intensities of the light from the latterat the disc, with the lens interposed, and… … Fig. 48. and let a be the distance from the paper disc to the light tested,c that to the standard, and /that to the lens. Since the intensity of illumination is the amount of light ona unit area, and since the total amount of light on C and C,under the conditions mentioned above, may be taken to be…
Physics
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