When you look through the ____, you see that the ____, incandescent, and halogen ____ have a ____ spectrum whereas the ____ tube shows a line spectrum. When you look at the spectra of mercury and sodium lamps, you see that the ____ lamp contains five colours, so it is ____, whereas the ____ lamp is ____ because its spectrum only shows a sort of yellow. Both lamps have a ____ spectrum. This ____ shows that the mercury lamp lets 5 ____ pass, so all the other wavelengths are ____. On the other ____, the sodium lamp only lets one wavelength pass, and all the other wavelengths are absorbed. The ____ Disc Experiement ____ that when the disc ____ very fast, all the colours are ____, the colour that appears is ____ because the colours on the disc are primary colours and secondary colours. Indeed, the ____ synthesis of all ____ colours gives white whereas the ____ synthesis of ____ colours gives black, so this is the reason why we saw grey ! For the next experiment, a piece of ____ with a ____ is put on the retroprojector, and then a diffraction ____ is put on the slit, so on the white board, we then see a ____ decomposition of light. If you apply a green filter on the slit, only ____ will appear on the board because the green filter ____ all the other ____. If you apply a cyan filter on the slit, green, ____, and ____ will appear on the board, because the other wavelengths are ____, and cyan is ____ of blue and green. With a yellow filter, we will see ____, ____, and green, because yellow is made of green and red.

Light spectra

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