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Other visible light hazards : Ordinary, visible light can present a hazard under certain conditions. You can burn paper by focussing the sun's rays using a small magnifying lens. The same effect can occur with the eye's lens on the back of the eyeball (the retina), and this usually happens when we are viewing an eclipse. The result can be total blindness or at least partial blindness. Similar dangers can occur when using daylight to illuminate a microscope slide.
The source of the danger is the sudden and intense illumination of a human eye by the sun. The accidents occur because it is difficult to ensure that a filter is going to absorb sufficient light to make it safe to view a sudden appearance of the sun, such as an eclipse, directly. The absorbent powers of a filter won't be instrument. discovered until it is too late, and the time-honoured method of using smoked glass is much unreliable. You can imagine how much worse the damage would be to the human eye if an eclipse was viewed through any optical instrument, e.g. binoculars, reflecting devices on microscopes, etc.
The only safe way to view an eclipse is to look at an image of the sun projected onto a screen. This means that a laboratory or classroom would have to be turned into a projection room, i.e. blacked out with a screen and an optical system need only be a 1 cm hole in a blind to a limit the required light and a plain mirror to direct the light onto the screen, Figure.
Figure: Safe way to view an eclipse
Explain Colouration of faeces - Functions of Bile The iron-free breakdown products of haemoglobin (i.e. bilirubin and biliverdin) oxidize to brown stereobilin. This stereobilin
Formation of the solar system: This theory is based on the assvmption that the Sun and all the planets were formed from a huge rotating cloud df interstellar gas and dust.
what are the condition necessary for heat transfer to occur?
To show the impact of a raindrop on soil Place a saucer or jar lid filled with soil on a piece of white paper. Fill a medicine dropper with water and hold it about a metre abov
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FACTORS FOR BROAD AREA OF SCIENTIFVC ACTIVITY
discuss homeostatis. I have choosen the bodies temperature and I need to discuss it and what effects it has on the body
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