 | John Johnston - Physics - 1846 - 314 pages
...the mirror is a part, and the surface of the mirror. Let AEB, figure 158 a, be a concave mirror ; C, the centre of the sphere of which the mirror forms a part ; and d efg h parallel rays. After reflection they will be collected in the focus, F, where the light... | |
 | François Arago - Astronomy - 1848 - 108 pages
...Natural Philosophy. The following properties of concave mirrors, are extracted from the same work: The focus of a concave mirror is the point in which...centre of the sphere, of which the mirror forms a pert. Parallel »ays, falling on a concave mirror, are converged to a focushalf way between the centre... | |
 | John Johnston - Physics - 1854 - 420 pages
...sphere of which the mirror is a part, and the surface of the mirror. Let AEB, be a concave mirror ; C, the centre of the sphere of which the mirror forms a part ; arid d efg h parallel rays. After reflection they will be collected in the focus, F, where the light... | |
 | Benjamin Silliman - Physics - 1859 - 750 pages
...concave mirror, fig. 401, converge, after reflection, to a point equi-distant between the mirror and the centre of the sphere, of which the mirror forms a part. This point is called the principal focus. Rays of light emanating from the principal focus of a concave... | |
 | Benjamin Silliman - Physics - 1861 - 780 pages
...concave mirror, fig. 327, converge, after reflection, to a point equidistant bctween the mirror and the centre of the sphere, of which the mirror forms a part. This point is called the principal focus. Rays of light emanating from the principal focus of a concave... | |
 | Adolphe Ganot - Physics - 1865 - 518 pages
...apply equally to concave and convex mirrors : The middle point of the mirror is called its vertex. The centre of the sphere, of which the mirror forms a part, is called the optical centre. The indefinite straight line through the optical centre and the vertex,... | |
 | Adolphe Ganot, William Guy Peck - Physics - 1871 - 510 pages
...definitions apply equally to concave and convex mirrors: The middle point of the mirror is called its vertex. The centre of the sphere, of which the mirror forms a part, is called the optical centre. The indefinite straight line through the optical centre and the vertex,... | |
 | Thomas Ruggles Pynchon - Physics - 1873 - 608 pages
...given of a spherical mirror of this description. MN is the mirror, A is its middle point or centre, C is the centre of the sphere of which the mirror forms a part, and AB is a line perpendicular to the middle point of the mirror. Now upon the line AB — the principal... | |
 | Adolphe Ganot - Physics - 1881 - 550 pages
...apply equally to concave and eonvex mirrors: — The middle point of the mirror is called its vertex. The centre of the sphere, of which the mirror forms a part, is called the centre of curvature. The indefinite straight line through the centre of curvature and... | |
 | Royal Society (Great Britain) - Mathematics - 1882 - 434 pages
...we call centering is accomplished by the three screws which attach the mirror to the cap, and causes the centre of the sphere of which the mirror forms a part to be at the centre of the object-glass. To test this point a tube 1 foot long is put on the collimator... | |
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The following definitions apply equally to concave and convex mirrors: The middle point of the mirror is called its vertex. The centre of the sphere, of which the mirror forms a part, is called the optical centre. 
