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

Explain the diaphragm, Explain the Diaphragm The diaphragm is a muscula...

Explain the Diaphragm The diaphragm is a muscular membranous partition separating the abdominal and thoracic cavities and functioning in respiration. It consists of a central

Z, symbiotic relationship of protozoans

symbiotic relationship of protozoans

Introduction to personal safeties, INTRODUCTION : In this unit, we introdu...

INTRODUCTION : In this unit, we introduce you to the fundamental of personal safety code in a laboratory. If you do not have safe laboratory practice, your life and those of your

For miscible solid and liquid wastes-chemical wastes, For water soluble/mis...

For water soluble/miscible solid and liquid wastes The familiar method of mopping the waste with plenty of water and running the same into the drainage could be done for miscib

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

Integumentary system , _____ are often responsible for clogging pores and c...

_____ are often responsible for clogging pores and causing pimpiles

Explain sinus tachycardia - electrocardiogram, Explain Sinus Tachycardia - ...

Explain Sinus Tachycardia - Electrocardiogram When the only abnormality is that the heart rate at rest is more than 100 per minute, the condition is known as sinus tachycardia.

Landslides, give me information on topic landslides.

give me information on topic landslides.

Extinguishing a fire , EXTINGUISHING A FIRE : The techniques and equipment...

EXTINGUISHING A FIRE : The techniques and equipment which you will learn about in this section relate to the standard kinds of fire fighting equipment found in buildings open to t

Nerve tissue, What is a feature of a nerve tissue?

What is a feature of a nerve tissue?

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