A system of natural philosophy, designed for the use of schools and academies (1845)
Moffat, J[ohn] M. [from old catalog] · Philadelphia, E. C. Biddle · leaf 377
rincipal focus of a convex lens ? In what position will the image appear when the object is beyond theprincipal focus ? Explain the cause of this on the diagram. In what manner may this position of the image be verified ? What is a camera obscura? To what is the construction of the eye analogous?… … exist likewise multitudes of animals, in which no organ of vision canbe discovered ; but it appears, thatin such the sense of feeling is ex-tremely delicate, and therefore supplies the defect of the other senses...128. In the following descriptive notices of the organs of vision,and the phenomena…
Physics
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