Elementary treatise on physics, experimental and applied, for the use of colleges and schools (1898)
Ganot, A. (Adolphe), 1804-1887 · London, Longmans, Green · leaf 566
rty of right- angled prisms is frequently used in optical instruments, such as the camera lucida (615) and the prismatic compass (71 1), instead of metal reflectors, which readily tarnish. They are also largely used in the camera obscura in changing the direction of images for projection purposes.… … diminishes. Hence, according as the direction of the ray LI tends to become parallel with the face AB, does this ray tend to emerge at the second face.
Physics
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