 Philosophers have put forward the thesis that the validity or non-validity of Euclidean geometry cannot be proved by empirical observations. It must in fact be granted that in all such observations essentially physical assumptions, such as the statement...  An Elementary Text-book of Physics: Light - Page 120by Robert Wallace Stewart - 1909Full view - About this book
 | William Chauvenet - 1864 - 720 pages
...the earth, we have only to put <f> = <f' and p = 1. REFRACTION. 105. General laws of refraction. — The path of a ray of light is a straight line so long as the ray is passing through a medium of uniform density, or through a vacuum. But when a ray passes... | |
 | William Chauvenet - Astronomical instruments - 1874 - 724 pages
...the earth, we have only to put <f = <p' and p = 1. REFRACTION. 105. General laws of refraction.—The path of a ray of light is a straight line so long as the ray is passing through a medium of uniform density, or through a vacuum. But when a ray passes... | |
 | Hermann Weyl - Relativity (Physics) - 1922 - 370 pages
...fact be granted that in all such observations essentially physical assumptions, such as the statement that the path of a ray of light is a straight line and other similar statements, play a prominent part. This merely bears out the remark already made... | |
 | Ernest William Hobson - Science - 1923 - 532 pages
...metric system, for purposes of application, arises from the fact that, if we employ it, we can assert that the path of a ray of light is a straight line. It has frequently been suggested that astronomical observation might be employed to decide the question... | |
 | Ernest William Hobson - Science - 1923 - 538 pages
...metric system, for purposes of application, arises from the fact that, if we employ it, we can assert that the path of a ray of light is a straight line. 10—2 It has frequently been suggested that astronomical observation might be employed to decide the... | |
 | Paul K. Feyerabend, Grover Maxwell - Methodology - 1966 - 530 pages
...fact be granted that in all such observations essentially physical assumptions, such as the statement that the path of a ray of light is a straight line and other similar statements, play a prominent part. This merely bears out the remark already made... | |
 | Illuminating Engineering Society - Lighting - 1912 - 770 pages
...Many a photograph has been taken by using a pinhole in place of a lens. When the statement is made that the path of a ray of light is a straight line path, it is understood that this is only true when the medium through which it passes is of uniform... | |
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