Philosophical MagazineTaylor & Francis, 1807 - Physics |
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Page 340
... crystalline lens alters with the distance of the object from the eye . Dr. Porterfield thinks , that the ad- justment of the eye is produced by an alteration in the cur- vature of the cornea and a motion of the crystalline lens . De la ...
... crystalline lens alters with the distance of the object from the eye . Dr. Porterfield thinks , that the ad- justment of the eye is produced by an alteration in the cur- vature of the cornea and a motion of the crystalline lens . De la ...
Page 341
... crystalline lens , for they are too dense to admit of that infinite variety of changes which the eye undergoes every day . As the crystalline lens alone is sufficient to form a distinct image of an object upon the retina , it is ...
... crystalline lens , for they are too dense to admit of that infinite variety of changes which the eye undergoes every day . As the crystalline lens alone is sufficient to form a distinct image of an object upon the retina , it is ...
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 ...
Contents
CONTENTS | 3 |
1542 | 5 |
Summary Considerations upon variegated Colours | 11 |
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