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Fibre optics:
The songs you hear on your transistor, or the pictures you see on your TV are canied from the studios to your home on radiowaves. Telephone calls you make, on the other hand, are bansmitted by electric current flowing in copper wires. In-the recent past,-new technologies have sppeared for transmitting various kinds of electric signals on glass fibres. This has been possible due to the advances in fibre optics technology. Fibre optics is the technique of transmitting light waves through glass wires as thin as human hair. These wires called optical fibres could be made of glass or transparent plastic, quartz, nylon or polystyrene. Opticalfibres are thin hair-like solid strands that carry light along their length, by a process of multiple total internal reflections (Fig). We will not go into the details of the process. In this process the beam of light entering at one end is transmitted along the fibre, without loss of intensity, whether the fibre is straight or bent in a curve.
Explain Undifferentiated Cells in an Organism These cells are capable of undergoing division and development, for example, the stem cells (animals) and meristematic cells (plan
Evidence Favouring the Big Bang One piece of evidence comes from the expansion of the universe which we have already described. The expanding universe suggests that the matt
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Digestion in the Mouth The mouth receives food. The tongue serves in swallowing, manipulating the food for chewing and in perceiving taste. The teeth mechanically subdivide
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can you explain to me the mohs hardness scale ?
How can we know the parent material of soils?
Analysis soil texture by Feel Method Soil texture was recognised from very early times by experienced farmers from the "feel" of moist soil placed between the thumb and the for
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