Study the given picture above and write a composition on it (approx. 450-500 words).
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Answer:
the fact or phenomenon of light, radio waves, etc. being deflected in passing obliquely through the interface between one medium and another or through a medium of varying density.
change in direction of propagation of any wave as a result of its travelling at different speeds at different points along the wave front.
measurement of the focusing characteristics of an eye or eyes.
Answer:
Today, a kid who barely knows to speak well, knows what a mobile phone is literally. A mobile phone or cell phone is an electronic telecommunication device with the same basic capability as a conventional fixed-line, telephone, but which is also entirely portable and is not required to be connected with a wire to the telephone network. Most current mobile phones connect instead to the network using a wireless radio wave transmission technology.
In addition to the standard voice function of a telephone, a mobile phone can support many additional services such as SMS for text messaging, packet switching for access to the internet, and MMS for sending and receiving photos and videos. In less than twenty years, mobile phones have gone from being rare and expensive pieces of equipment used by businesses to an all pervasive low-cost personal item. In many countries, mobile phones now outnumber landline telephones, with most adults and many children now owning mobile phones
A mobile phone itself has become a fashion statement wherein the brand, cost type of handset, colour, added accessories reflect the personality of a person. People have made mobile phones a status symbol instead of necessity. This has thus given rise to an increase in criminal and antisocial activities in order to have money to satisfy this growing need to show off.
It’s tough to fit a music player, digital camera, phone, GPS all in the pocket at the same time. Fortunately, today’s cell phones come with all these features and thus it is not a problem anymore.
Hillary Clinton has once said
There are 4 billion cell phones in use today.
However, with new technologies in the mobile phones, concerns have arisen about its effects on the health of the users. Scientific evidence also states an increase in certain types of rare tumours (cancer) seen in long-time, persistent heavy users. More recently, a study provided significant evidence of genetic damage under certain conditions.
Evidently, it has also been seen that there is a steep decline in the population of some birds due to the radiations emitted from mobile phones and its network towers. Especially the population of sparrows are seen to be migrating to less populated areas. It has also been observed that recently most of the accidents on roads occur because of distractions via mobile phones. Motorists have a much higher risk of collisions and losing control of the vehicles while talking on the mobile phones while driving.
Explanation:
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