avoiding eye contact

Avoid physical contact with patients suffering with fl..

Two important characteristics of the desert i.e., the scarcity of rainfall and high temperature determine the existence, distribution and adaptations of the animals of the desert. The characteristic animals of the desert are small herbivorous rodents, reptiles and insects. Birds and mammals which h..

Measurement of Length - Different types of lengths are measured by using different types of instruments. Lengths like the length of cloth or length of a line can be measured by using measuring tape, a metre scale or a foot rule. But these instruments cannot be used to measure the diameter of a meta..

To avoid the risk of electric shocks, the metal of an electrical appliance is 'earthed'. Earthed means to connect the metal case of the appliance to the earth (at zero potential) by means of a metal wire (copper) called the earth wire. One end of the earth wire is buried deep in the eart..

Usually an electric appliance such as a heater, an iron, etc. are fitted with all the 3 wires namely live, neutral and earth. The earth wire is connected to the metallic body of the appliance. This is done to avoid accidental shock. Suppose due to some defect, the insulation of the live w..

. One such mechanism that protects the eye is the lacrimal apparatus . The continuous washing action of tears produced by the lacrimal glands, helps to keep microbes from settling on the surface of the eye. If an irritating substance or large number of microbes make contact..

Presbyopia - Presbyopia is caused when the centre of the eye lens hardens making it unable to accommodate near vision. This condition generally affects almost everyone over the age of 50 - even those with myopia. Eyeglasses with bifocal or progressive lenses are prescribed to correct or i..

The mirage is caused by the total internal reflection of light at layers of air of different densities. In a desert, the sand is very hot during day time and a result the layer of air in contact with it gets heated up and becomes lighter. The lighter air rises up and the denser air from a..

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Solar Cooker - A solar heating device is one which allows collection of a large amount of heat from the sunlight in a given region and restricts the loss of heat to the surrounding in the form of radiation. The following facts help us to design an efficient solar cooker: A black body absorbs maximu..