Carpenter, William Benjamin, 1813-1885 · London : John Churchill · leaf 67
upon any surface placed in the focus, and adapted to receivethe rays. It wiU be evident from what has gone before, thatif the object be placed at twice the distance of the principalfocus, the image, being formed at an equal distance on theother side of the lens (§ 5), will be of the same dimensions… … Formation of Images by convex lenses. the lens, the image a b will be nearer to it, and smaller thanitself. Further, it is to be remarked, that the larger theimage in proportion to the object, the less bright it wiU be,because the same amount of light has to be spread over a SPHEEICAL ABEE-EATION.…
Microscopy
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