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

Define specific defence mechanism, Define Specific Defence Mechanism In...

Define Specific Defence Mechanism In the section on white blood cells, we learnt that whenever a germ or infection enters our body, the WBCs snap to attention and destroy the c

Microbes, Microbes: You should know  that invisible microbes are presen...

Microbes: You should know  that invisible microbes are present everywhere, because  they can surviveeven under very inhospitable conditions. They are all around us, in the air

Medicine in iron age, Medicine: The other area, in which  the Greek ...

Medicine: The other area, in which  the Greek developments  had a parallel in India, was medicine, although encouragement for this development  in the two cases came from di

Explain the sensory and the motor neurons, Explain the Sensory and  the Mo...

Explain the Sensory and  the Motor Neurons The peripheral nervous system consists of 1. Sensory neurons running from stimulus receptors that inform the central nervous syste

Explain bi-caval anastomosis teclznique, Explain Bi-caval Anastomosis Teclz...

Explain Bi-caval Anastomosis Teclznique This is the currently referred technique. In presuming the donor heart, more of SVC is dissected and retained. The length of IVC retaine

Waves, Compare and contrast the characteristics of sound waves and electrom...

Compare and contrast the characteristics of sound waves and electromagnetic

Waves, Do You Know Where i Might Be Able To Find An Online Science book for...

Do You Know Where i Might Be Able To Find An Online Science book for Chapter 16 In 8th Grade

Big bang boom, if we drink liquid nitrogen then what happen

if we drink liquid nitrogen then what happen

Single neurons and multilayer networks, 1. The output of a single neuron is...

1. The output of a single neuron is given by y = f(w 1 x 1 +w 2 x 2 +w 0 x 0 ), where x 1 and x 2 are inputs, x 0 has the constant value 1, w 0 , w 1 and w 2 are parameters

Explain about the soil particle distribution, Soil particle distribution ...

Soil particle distribution The grouping of soil particle distribution into different groups has been done, though arbitrarily, each group represents a range. The limit does no

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