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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
Technical Developments in Feudal Society: Other innovations used and improved by the Europeans were the lenses and the spectacles. This gave an impetus to the further study
A weather picture A piece of white blotting paper is immersed in a solution having two parts cobalt chloride to one part common salt. While wet the paper will stay pink, but wh
discuss the importance of society and culture to existence of man .
The digestive system is made up of two groups of organs: Alimentary tract, which includes mouth, pharynx, oesophagys, stomach, small intestine, large intestine, appendix
Ship-building: The shipbuilding industry in the seventeenth century. witnessed far-reaching changes that mainly resulted from imitating European techniques. The Indian sea-g
Types of soils Secure samples of soil from as many places as possible and place in glass jars. Try to get examples of a sandy soil, a loam soil, a clay soil, a soil rich in dec
What is the distance of the sun from earth
Water-mill in Golden era: The water-mills were also invented in the classical period. But they came to be widely used only in the Middle Ages. The wind-mills and water-mills
Moving water by reducing air pressure Secure two small bottles. Fill single about half full of water and close it with a single-hole stopper carrying a length of glass tube tha
what is non renewable and renewable resource
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