Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 76
nsity ofthe rays (i.e. the quantity.of light emanating froma given surface - elementwithin a cone of givennarrow angle) varies inthe proportion of the co- Fm M _The intengitv ^ emitted rayfl is uofc ^sine of the angle of obliejui- same in all directions, ty under which the ray is emitted; in other… … 52 VISION WITH THE COMPOUND MICEOSCOPE which the ray is sent out. The rays are more intense in proportionas they^ are inclined to the surface which emits them, so that a pencilvaries in proportion as it is taken close to or is removed from theperpendicular. A pencil is not, therefore, correctly…
Microscopy
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