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When looking through a slide with two very small holes located
very close together (optometer aperture), in the absence of
accommodation relative to their distance, objects close
to the eye appear to be relatively well focussed except that there
appear to be two of ...
If a circular disc separated into various differently coloured sectors is rotated by a motor so fast that the eye can no longer distinguish the colours, a mixed colour is then perceived. By varying the composition and size of the sectors, it is possible to give the impression of any ...
The content of plant ash is investigated to investigate the
mineral content of plants. The characteristic lines of the elements
are determined using a small spectroscope. The cations of sodium,
potassium and calcium are detected qualitatively.
Active carbon is a good absorbent and as such is excellent when used as a filter. During water treatment, for example, active carbon filters are used to remove pesticides and detergents (soap and washing-up liquid). The cleansing of water can be demonstrated impressively by ...
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