Light Its Properties And Effects
Light Its Properties And Effects
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If we cast a pure and unmixed yellow light on scarlet cloth, it will appear yellow, because the scarlet cloth does not absorb LIGHT OF ONE COLOUR. 81 all the yellow rays, but reflects some of them ; and if we illuminate blue cloth with yellow light, it will appear nearly black, because it absorbs nearly all the yellow light, and reflects scarcely any of it. But whatever be the nature and colour of the bodies on which the yellow light falls, the light which it reflects must be yellow, since they... have no other light ; and those which are not capable of reflecting yellow light must appear absolutely black, however brilliant be their colour in the light of day.
It has been long known, that salt thrown into the wick of a flame produces yellow light ; but this is mixed with blue and green rays, and is, besides, small in quantity. An apparatus has therefore been constructed for a cu- rious experiment, and the efi'ect is thus described by Sir David Brewster : — " Having obtained the means of illu- minating any apartment with yellow light, let the exhi- bition be made in a room with furniture of various bright colours, and with oil or water-coloured paintings on the wall.
What to read after Light Its Properties And Effects?
You can find similar books in the "Read Also" column, or choose other free books by Religious Tract Society Great Britain to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
If we cast a pure and unmixed yellow light on scarlet cloth, it will appear yellow, because the scarlet cloth does not absorb LIGHT OF ONE COLOUR. 81 all the yellow rays, but reflects some of them ; and if we illuminate blue cloth with yellow light, it will appear nearly black, because it absorbs nearly all the yellow light, and reflects scarcely any of it. But whatever be the nature and colour of the bodies on which the yellow light falls, the light which it reflects must be yellow, since they... have no other light ; and those which are not capable of reflecting yellow light must appear absolutely black, however brilliant be their colour in the light of day.
It has been long known, that salt thrown into the wick of a flame produces yellow light ; but this is mixed with blue and green rays, and is, besides, small in quantity. An apparatus has therefore been constructed for a cu- rious experiment, and the efi'ect is thus described by Sir David Brewster : — " Having obtained the means of illu- minating any apartment with yellow light, let the exhi- bition be made in a room with furniture of various bright colours, and with oil or water-coloured paintings on the wall.
What to read after Light Its Properties And Effects?
You can find similar books in the "Read Also" column, or choose other free books by Religious Tract Society Great Britain to read onlineMoreLess
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