Philosophical MagazineTaylor & Francis, 1807 - Physics |
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Page 343
... lens of 24 inches focus is fixed to represent the crystalline lens ; and the other end of the instrument contains a piece of ground glass , 4 inches in diameter , polished on one side , to represent the retina . This instrument , being ...
... lens of 24 inches focus is fixed to represent the crystalline lens ; and the other end of the instrument contains a piece of ground glass , 4 inches in diameter , polished on one side , to represent the retina . This instrument , being ...
Page 78
... lens upon one slip , so that both are in contact , the penknife will give three shadows ; but if the convex lens should be of a very short focus , or the slips of glass a little separated , four of them may be perceived ; for in that ...
... lens upon one slip , so that both are in contact , the penknife will give three shadows ; but if the convex lens should be of a very short focus , or the slips of glass a little separated , four of them may be perceived ; for in that ...
Page 81
... lens or glass , and two sets of rings will be obtained . In the same manner , by laying upon a concave glass mirror a convex lens , we shall also have two sets of rings . The generalizations that have been mentioned when one set of ...
... lens or glass , and two sets of rings will be obtained . In the same manner , by laying upon a concave glass mirror a convex lens , we shall also have two sets of rings . The generalizations that have been mentioned when one set of ...
Contents
CONTENTS | 3 |
1542 | 5 |
Summary Considerations upon variegated Colours | 11 |
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