Other visible light hazards-lasers, Science

Assignment Help:

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.

398_Safe way to view an eclipse.png

Figure: Safe way to view an eclipse


Related Discussions:- Other visible light hazards-lasers

FST.., Describe the factors which decide the broad area of scientific activ...

Describe the factors which decide the broad area of scientific activity/

Measuring atmospheric pressure with a bicycle pump, Measuring atmospheric p...

Measuring atmospheric pressure with a bicycle pump A bicycle pump with the washer reversed as represents can be used to calculate atmospheric pres- sure. The piston can be made

Hazards in the laboratory, HAZARDS IN THE LABORATORY : Laboratories in...

HAZARDS IN THE LABORATORY : Laboratories in the biology department of schools, colleges and universities and other higher level organisation such as hospitals, veterinary esta

Levels of orgnization, ehat is protoplasm and other levels of organization

ehat is protoplasm and other levels of organization

Microscope, explain the parts of the microscope

explain the parts of the microscope

Explain mutarotation, Mutarotation:-   The  process whereby the  configu...

Mutarotation:-   The  process whereby the  configuration  of  an anomeric carbon converts from a and p and vice-versa.

Water conservation, true or false? water conservation efforts have been who...

true or false? water conservation efforts have been wholly inaffective

Organs, what are the organs of respiration in the lower form of animals?

what are the organs of respiration in the lower form of animals?

Residence time, If the Quabbin Reservoir Watershed is 100 km2, the average ...

If the Quabbin Reservoir Watershed is 100 km2, the average precipitation in New England is 130 cm/year, and the volume of the reservoir is 1.5 x 1012 liters, what is the residence

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd