 | Bengal council of educ - 1848 - 394 pages
...and emergence are very small ; 2nd, when the ray is emergent or incident perpendicularly ; and 3rd, when the angle of incidence is equal to the angle of emergence. Now if p. be the refractive index, a the refracting angle of the prism, c and e' the angles of incidence... | |
 | 1851 - 626 pages
...and emergence are very small ; 2nd, when the ray is emergent or incident perpendicularly ; and 3rd, when the angle of incidence is equal to the angle of emergence. Now if p be the refractive index, a the refracting angle of the prism, c and c' the angles of incidence... | |
 | Stephen Parkinson - 1859 - 336 pages
...(u 2 - 1) sin A -rn = . „ _, -T = a positive quantity. Hence <> = r makes D a mini mnmum. That is, when the angle of incidence is equal to the angle of emergence, the deviation is less than in any other case. 94. We give another method of obtaining the condition... | |
 | Institution of Civil Engineers (Great Britain) - 1897 - 502 pages
...¿i) = (l _ sin2 </>]) (l - ¡j? sin2 ^^X whence or sin2 <f>1 = sin <f>1 = \j/1 and .•.$ = $. Hence when the angle of incidence is equal to the angle of emergence, the deviation is a unique mininmm. It is possible to find an expression which will give the tangents... | |
 | Archibald Stanley Percival - 1899 - 422 pages
...symmetrically through a prism the deviation is a minimum. A ray passes symmetrically through a prism when the angle of incidence is equal to the angle of emergence, ie when <f> = -$-. If d> increases </>' increases also, at the same time i/r' diminishes and consequently... | |
 | Charles Greeley Abbot - 1911 - 542 pages
...incidence. This smallest angle of deviation is called the angle of minimum deviation, and is secured when the angle of incidence is equal to the angle of emergence. For this position of the prism the following relation holds, if we designate the angles of incidence... | |
 | William Reed Veazey, Charles David Hodgman - 1914 - 346 pages
...Minimum Deviation. — The deviation or change of direction of light passing through a prism is a minimum when the angle of incidence is equal to the angle of emergence. Principal Focus of a lens or spherical mirror is the point of convergence of light coming from a source... | |
 | 368 pages
...directly. 25. Example. A ray is incident in a principal plane at the base of a triangular prism and afier being reflected at the other two faces emerges at...maximum. Adopting the convention of signs of Art. 20, let 0 be the angle of incidence of the ray, 0' the angle of refraction, 61 and #2 the angles of reflection... | |
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The deviation or change of direction of light passing through a prism is a minimum when the angle of incidence is equal to the angle of emergence. 