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

Heterotrophic nutrition, how many types of heterotrophic nutrition in plant...

how many types of heterotrophic nutrition in plants?..

What is heat?, what are good conductors of heat?why is advantages to have v...

what are good conductors of heat?why is advantages to have ventilators in houses at the top of walls?

Explain the transport properties of loop of henle, Explain the Transport pr...

Explain the Transport properties of Loop of Henle The loop of Henle, as shown in Figure, has a descending limb and an ascending limb. As the filtrate moves down the loop of Hen

Elasticity of price expectations, What happens if the elasticity of Price e...

What happens if the elasticity of Price expectations is less than one?

Explain coenzyme, Coenzyme  : A molecule that binds to an enzyme and  i...

Coenzyme  : A molecule that binds to an enzyme and  is essential for its activity,  but  is  not  permanently altered  by  the  reaction. Many coenzymes are derived from vitami

Method for water immiscible-insoluble liquid-chemical wastes, For water imm...

For water immiscible/insoluble liquid/solid wastes which can be emulsified The spillage of water immiscible/insoluble liquid/solid could be scrubbed with brush in presence of

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