¸üµÖŸÖ ׿ÖÖÖ ÃÖÓãÖÖ, ú´ÖÔ¾Ö߸ü ×¾ÖªÖ¯ÖϲÖÖê׬ÖÖß, ´Ö¬µÖ ×¾Ö³ÖÖÖ, ÃÖÖŸÖÖ¸üÖ Std.- 8th Subject- English Unit- 3.9 Optical Fibers Or Turning Light to Advantage
¸üµÖŸÖ ׿ÖÖÖ ÃÖÓãÖÖ, ú´ÖÔ¾Ö߸ü ×¾ÖªÖ¯ÖϲÖÖê׬ÖÖß, ´Ö¬µÖ ×¾Ö³ÖÖÖ, ÃÖÖŸÖÖ¸üÖ Std.- 8th Subject- English Unit- 3.9 When you are looking for something in a corner of a shelf, you naturally put on the light I the room- only to find that the light does not each into the shelf. Then you remember the science lesson which tells you that light travels in straight lines. So the rays from the cupboard and reach inside the shelf !
¸üµÖŸÖ ׿ÖÖÖ ÃÖÓãÖÖ, ú´ÖÔ¾Ö߸ü ×¾ÖªÖ¯ÖϲÖÖê׬ÖÖß, ´Ö¬µÖ ×¾Ö³ÖÖÖ, ÃÖÖŸÖÖ¸üÖ Std.- 8th Subject- English Unit- 3.9 Don`t you wish then that light didn`t follow such rules? Remember Mullah Nasiruddin? How easy it would have been for him to find his lost ring if only he could have piped the light to the right place. But, the clever Mullah could not have done it, because scientists in his time had not learnt to make light bend. Optical fibers were only developed after the 1950`s.
¸üµÖŸÖ ׿ÖÖÖ ÃÖÓãÖÖ, ú´ÖÔ¾Ö߸ü ×¾ÖªÖ¯ÖϲÖÖê׬ÖÖß, ´Ö¬µÖ ×¾Ö³ÖÖÖ, ÃÖÖŸÖÖ¸üÖ Std.- 8th Subject- English Unit- 3.9 An optical fiber is a glass or plastic fiber. It is much, much finer even that a heir and very flexible. It can be bend any way we like. When light rays enter it a one end, they are repeatedly reflected from its sides back into the fiber by a process called total internal reflection (TIR). The rays travel in a zigzag manner through the fiber. Hence, the fiber can be bent or twisted or wound in any way and the light rays go wherever the fiber goes!
¸üµÖŸÖ ׿ÖÖÖ ÃÖÓãÖÖ, ú´ÖÔ¾Ö߸ü ×¾ÖªÖ¯ÖϲÖÖê׬ÖÖß, ´Ö¬µÖ ×¾Ö³ÖÖÖ, ÃÖÖŸÖÖ¸üÖ Std.- 8th Subject- English Unit- 3.9 Wonderful things can be done by bending or ‘piping’ light in this way. Researchers at the University of Michigan first used optical fiber bundles to make a ‘gastro scope’ in Doctors use the gastro scope to guide light into the darkness of our stomach to find out what is wrong inside. Now-a-days, ‘fiberscope’s’ help doctors to look Into almost all parts of our digestive tract. The gastro scope is made of two, long, thin bundles of very fine optical fibers. The two bundles together from a kind of rope which is about 8 mm thick
¸üµÖŸÖ ׿ÖÖÖ ÃÖÓãÖÖ, ú´ÖÔ¾Ö߸ü ×¾ÖªÖ¯ÖϲÖÖê׬ÖÖß, ´Ö¬µÖ ×¾Ö³ÖÖÖ, ÃÖÖŸÖÖ¸üÖ Std.- 8th Subject- English Unit- 3.9 This rope is slowly and carefully pushed inside the patient`s body till it reaches the part that the doctor wants to examine. One bundle carries the light image of the inner part to the doctor’s eyes or to a camera! Thus, using the optical fiber the doctor can ‘see’ inside the body of the patient without cutting it open!
¸üµÖŸÖ ׿ÖÖÖ ÃÖÓãÖÖ, ú´ÖÔ¾Ö߸ü ×¾ÖªÖ¯ÖϲÖÖê׬ÖÖß, ´Ö¬µÖ ×¾Ö³ÖÖÖ, ÃÖÖŸÖÖ¸üÖ Std.- 8th Subject- English Unit- 3.9 Optical fibers have many others amazing uses. They are very useful in communications. Today, they have almost entirely replaced copper cables in telephone and computer networks. Cables of optical fiber are lighter and thinner. So, less space is needed in laying them underground. They are much much more efficient than copper cables in carrying voice or computer data over thousands of kilometers.
¸üµÖŸÖ ׿ÖÖÖ ÃÖÓãÖÖ, ú´ÖÔ¾Ö߸ü ×¾ÖªÖ¯ÖϲÖÖê׬ÖÖß, ´Ö¬µÖ ×¾Ö³ÖÖÖ, ÃÖÖŸÖÖ¸üÖ Std.- 8th Subject- English Unit- 3.9 The miracle of millions of people speaking to others all over the world at same moment, the hundreds of TV channels that we can see, the unlimited loads of data we send using the internet- none of this would have been possible without optical fibers.
¸üµÖŸÖ ׿ÖÖÖ ÃÖÓãÖÖ, ú´ÖÔ¾Ö߸ü ×¾ÖªÖ¯ÖϲÖÖê׬ÖÖß, ´Ö¬µÖ ×¾Ö³ÖÖÖ, ÃÖÖŸÖÖ¸üÖ Std.- 8th Subject- English Unit- 3.9 But that’s not all. Optical fibers are used in many other advanced instruments which are required in fields like chemical and marine engineering. In some buildings, optical fibers are used to route sunlight from the roof to other parts of the building. (No electricity needed!)
¸üµÖŸÖ ׿ÖÖÖ ÃÖÓãÖÖ, ú´ÖÔ¾Ö߸ü ×¾ÖªÖ¯ÖϲÖÖê׬ÖÖß, ´Ö¬µÖ ×¾Ö³ÖÖÖ, ÃÖÖŸÖÖ¸üÖ Std.- 8th Subject- English Unit- 3.9 Optical fibers are used to light up showcases which display things made of crystal glass. A number of fiber bundles light up the glassware from different angles. Can you imagine what a brilliant sight that would make?
¸üµÖŸÖ ׿ÖÖÖ ÃÖÓãÖÖ, ú´ÖÔ¾Ö߸ü ×¾ÖªÖ¯ÖϲÖÖê׬ÖÖß, ´Ö¬µÖ ×¾Ö³ÖÖÖ, ÃÖÖŸÖÖ¸üÖ Std.- 8th Subject- English Unit- 3.9 You might have seen the beautiful fiber optic ‘light fountain’ in shop windows. Numerous glass fibers rise like a fountain from a base. There is a bulb inside the base. When it is switched on, the tip of each fiber shines like a tiny spark. If it is dark around the lamp, you might also faintly see the light ‘flowing’ through the fibers. In some lamps, even the colour of the light changes continuously It makes a pretty picture indeed. Optical fibers can do all kinds of things from saving life to making life beautiful