Elementary Treatise on Natural Philosophy, Volumen4D. Appleton, 1891 |
Dentro del libro
Resultados 1-5 de 74
Página 861
... object ; but effective brightness may be less . Same principle applies to mirrors . Reason why high magnification often produces loss of effective brightness , 1037. Intrinsic brightness of image in theoretically perfect telescope is ...
... object ; but effective brightness may be less . Same principle applies to mirrors . Reason why high magnification often produces loss of effective brightness , 1037. Intrinsic brightness of image in theoretically perfect telescope is ...
Página 947
... Objects , except such as are styled self - luminous , become invisible when brought into a dark room . The presence of something additional is necessary to render them visible , and that mysterious agent , whatever its real nature may ...
... Objects , except such as are styled self - luminous , become invisible when brought into a dark room . The presence of something additional is necessary to render them visible , and that mysterious agent , whatever its real nature may ...
Página 950
... objects will be more distinctly represented than those which are very near . M B ' A A These results are easily explained . Consider , in fact , an external object A B ( Fig . 643 ) , and let O be the hole in the shutter . The point A ...
... objects will be more distinctly represented than those which are very near . M B ' A A These results are easily explained . Consider , in fact , an external object A B ( Fig . 643 ) , and let O be the hole in the shutter . The point A ...
Página 951
... object between A and B will have their images between A ' and B ' . An inverted image A'B ' will thus be formed of the object A B. As the image thus formed of an external point is not a point , but a spot , whose size increases with ...
... object between A and B will have their images between A ' and B ' . An inverted image A'B ' will thus be formed of the object A B. As the image thus formed of an external point is not a point , but a spot , whose size increases with ...
Página 956
... object- glass of the telescope is so adjusted as to render the rays parallel on emergence , and in this condition they traverse the interval VELOCITY OF LIGHT . 957 between the two stations . Fig . 649. - Fizeau's Experiment . Fig . 650 ...
... object- glass of the telescope is so adjusted as to render the rays parallel on emergence , and in this condition they traverse the interval VELOCITY OF LIGHT . 957 between the two stations . Fig . 649. - Fizeau's Experiment . Fig . 650 ...
Otras ediciones - Ver todas
Términos y frases comunes
achromatic analyser angle of incidence beam body bright lines called centimetres centre coincidence colours concave mirror conjugate foci convex convex lens crystal curvature denote diameter direction distance employed equal experiment eye-piece flame focal length frequency of vibration fundamental note glass harmonics Hence Iceland-spar incident ray index of refraction interval inverted law of sines lens lenses luminous point magnifying power medium metres minimum deviation nearly node normal number of vibrations object object-glass oblique observer obtained octave optical ordinary parallel particles pencil perpendicular pipe pitch placed plane mirror plate polarization portion position principal axis principal focus prism produced propagation radius rarefaction ratio reflected rays refrangibility represented retina rotation screen seen side slit solar spectra spectrum spherical string subtends surface telescope tion tone traversing tube undulation velocity of sound vertical vibrations vibrations per second violet virtual image visual angle wave-front wave-length waves