Carpenter, William Benjamin, 1813-1885 · London : John Churchill · leaf 75
focus ; and it is obvious that as anincrease of divergence of no more than 10° would bring theextreme rays into a straight hue with each other, they wouldnot enter the lens at all; so that no further enlargement ofthe aperture can be practically useful. 15. The enlargement of the angle of aperture,… … CORUECTION FOE, THE COVEEING OF THE OBJECT. 53 circumstances, which, had previouslj passed unnoticed; andthe important discovery was made by Mr. Ross, that a veryobvious difference existed in the precision of the image, accord-ing as the object is viewed with or without a covering of talcor thin…
Microscopy
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