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

Architecture in golden era, Architecture: The architectural style of  I...

Architecture: The architectural style of  India underwent a drastic  change after the Turkish conquest. The Sultans and their nobles insisted on having arches and domes and com

Volanoes, what are the causes of volcanic eruption ?

what are the causes of volcanic eruption ?

Explain dacrocystography, Question 1. Why magnification technique is us...

Question 1. Why magnification technique is used in radiography? How it is performed? 2. Explain Dacrocystography. 3. Discuss the pre requisites for fluoroscopic study of

#titlko, Ask question #Minimum 100 words accept231

Ask question #Minimum 100 words accept231

Insight into robotics and robots, Insight into Robotics and Robots: The...

Insight into Robotics and Robots: The science of designing, building und using robots is called robotics. And what is a robot?  Many people  think of robots as mechanical pe

Properties of a beating heart - cardiovascular system, Properties of a Beat...

Properties of a Beating Heart Heart Let us study a few interesting properties of a beating heart which make it such a unique organ. 1. Automaticity 2. Rhythmicity 3. L

Periodic table, How did it change from Mendeleev to Mosely?

How did it change from Mendeleev to Mosely?

Steel and metal, what is a engineering physics about these substances

what is a engineering physics about these substances

Freezing by contact with a cooled liquid-lmmersion freezing, Freezing by Co...

Freezing by Contact with a Cooled Liquid: Immersion Freezing In this method, the food is immersed in low-temperature brine to achieve fast temperature reduction through direct

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