Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
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.
Figure: Safe way to view an eclipse
what is risk?
Explain the functions of Multicellular Organism Multicellular organisms are specialized quite similar to a team that does a lot of work efficiently as compared to a single pers
how many known plam nets are in our solar system
Q. What are the impacts of minimally processed foods? Impacts of minimally processed foods are: it maintains freshness and quality; convenient and ready-to-cook form products;
A compressed air pop-gun Use a straight piece of glass or plastic tubing of 1 or 2 cm in diameter and 15 or 20 cm in length. Make a piston by twisting some string on a pencil t
Layers of the Sun: Tbe Sun's body is made up of several layem Tbe layer that forms the viable surface of the Sun is called the photosphere-it is the surface that demarca
What constellations does the ecliptic pass by? Where is the Celestial Equator (in relation to the planets & the ecliptic)? Are the planets east /west of your local meridian? Whe
What causes winds? An uneven heating of the Earth's surface causes winds. On being heated, air becomes lighter and rises up. As a result, a region of low pressure is created. Th
Explain the Types of White Blood Cells White blood cells are actually a whole collection of different cells that work together to destroy bacteria and viruses. You may recall s
Explain the Transport of Fructose - Carbohydrates Fructose is converted to glucose after it is being transported. This occurs before entering the portal blood. The conversion o
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd