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Making a simple reflecting telescope
A simple reflecting telescope can be made from a concave mirror obtained from a shaving mirror. The mirror is arranged wooden box of suitable size in such a way that it can be tilted at dissimilar angles. An upright made of wood is attached to the box so that its angle may also be varied. Two short focus lenses are fixed in corks which are then placed in a short length of mailing tube as an eye-piece. Then join this eye- piece attached to the wood upright exactly at the focal
What do all optical instruments and devices have in common?
Explosives : As defined earlier, explosives release a large amount of gas and energy in a very short time. These are of four basic types: Mixed gases - Usually the mixture
Use of natural resources: you studied about various natural resources such as land, water, soil, minerals etc. You know that these resources are limited and precious. Therefore
what is cutaneous respiration
Define the Levels of Drugs in Urine Levels of alcohol and barbiturates (a group of drugs derived from barbituric acid that is used to sedate, to control convulsions or to induc
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.
Question 1 Discuss the efforts introduced to manage of air and water pollution Question 2 Comment briefly on agricultural practices in Arid zone Question 3 Anal
State about the Peaty soils Peaty soils occur in humid regions and have an accumulation of high organic matter. Such peaty soils containing considerable amount of soluble salt
Apart from acidic waste, bromine waste is also treated using this method. Exercises Examples: Perchloric acid, sulphuric acid, hydrochloric acid, nitric acid, phosphoric acid
What are covalent bonds? Covalent bonds are those in which electrons are shared by the atoms, and this sharing results in an attraction between the atoms to form a molecule. A
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