The Power of a Magnifying Glass Essay Example for Free

The Power of a Magnifying Glass Essay The magnification of a magnifying glass depends upon where it is placed between the users eye and the object being viewed, and the total distance between them. The magnifying power is equivalent to angular magnification (this should not be confused with optical power, which is a different quantity). The magnifying power is the ratio of the sizes of the images formed on the users retina with and without the lens.[3] For the without case, it is typically assumed that the user would bring the object as close to the eye as possible without it becoming blurry. This point, known as the near point, varies with age. In a young child it can be as close as 5 cm, while in an elderly person it may be as far as one or two metres. Magnifiers are typically characterized using a standard value of 0.25 m. The highest magnifying power is obtained by putting the lens very close to the eye and moving the eye and the lens together to obtain the best focus. The object will then typically also be close to the lens. The magnifying power obtained in this condition is MP0 =  ¼ÃŽ ¦ + 1, where ÃŽ ¦ is the optical power in dioptres, and the factor of  ¼ comes from the assumed distance to the near point ( ¼ m from the eye). This value of the magnifying power is the one normally used to characterize magnifiers. It is typically denoted mÃâ€", where m = MP0. This is sometimes called the total power of the magnifier (again, not to be confused with optical power). Magnifiers are not always used as described above, however. It is much more comfortable to put the magnifier close to the object (one focal length away). The eye can then be a larger distance away, and a good image can be obtained very easily; the focus is not very sensitive to the eyes exact position. The magnifying power in this case is roughly MP =  ¼ÃŽ ¦. A typical magnifying glass might have a focal length of 25 cm, corresponding to an optical power of 4 dioptres. Such a magnifier would be sold as a 2Ãâ€" magnifier. In actual use, an observer with typical eyes would obtain a magnifying power between 1 and 2, depending on where lens is held. Using this principle, a magnifying glass can also be used to focus light, such as to concentrate the suns radiation to create a hot spot at the focus.

Ayn Rand, Aristotle, and Selfishness :: essays research papers

Ayn Rand, Aristotle, and Selfishness Selfishness is an act that humans innately have implanted within them. Ayn Rand being a rational egoist had many moral beliefs, one being especially about selfishness. She believed that: â€Å"Self-interest, properly understood, is the standard of morality and selflessness is the deepest immorality.†( Ayn Rand 279) This basically emphasizes that you should see oneself, as an end to oneself. A person’s own life and happiness are their highest values, and that they don’t exist as servants or slaves to the interests of others. In the same way, others as well don’t exist as servants or slaves to a person’s own interests. Each person's own life and happiness is his/her crucial end. Ayn Rand, Aristotle, and Frederick Nietzsche all had theories behind this, which was that Humans are innately selfish. Threw out society today all humans are selfish and it is proven by these philosophers that it is naturally developed and there is no cure to prevent it. Ayn Rand, a great Russian philosopher, once questioned why shouldn’t one be selfish. Ayn Rand responded to that question with her theory which she called objectivist ethics. This theory states that humans are innately selfish. â€Å"Everyone does what they really want to do otherwise, they wouldn’t do it†.(Ayn rand 66) Rand believed that humans are rational beings and maintained the idea that rational people will help others if they get something in return. This idea is a voluntary co-operation, which applies to dealings with trade and justice. It also applies to human relationships. In developing her theory she criticized the ethics of altruism, which says that people should act out of selfish concern for others. Ayn Rand says in her book called â€Å"The Virtue of Selfishness† that the proper method of judging when one should help another person is by reference to one’s own rational self-interest and one’s own hierarchy of values. Ayn Rand followed Aristotle’s point of view. However unlike Aristotle she focused on an individual other than a community. â€Å"There is no such thing as ‘society’ †¦ only individual men† (Ayn Rand 279) Ayn Rand followed her great acknowledged teacher Aristotle. She changed her view slightly different from Aristotle which was to focus on an individual rather than focusing on a whole community. Aristotle believed that one’s own life is the only life one has to live for. Aristotle also stated that the â€Å"good† is what is objectively good for a particular man.

A Social Family Institution in India

Location: India has an area of approximately 3,287,580 sq. kilometers. It serves as a border to the Bay of Bengal the Indian Ocean, and to the Arabian Sea located to its west. Directly north of India are the Himalayas, the world†s biggest mountain range. India also serves as a neighbor to several different countries. Myanmar and Bangladesh located to its east, China, Nepal and Bhutan to the north, Sri Lanka to the South, and finally Afghanistan and Pakistan on the northwest. Topography: India is separated into 4 main regions, these are the Ganges, Indus Plains, Desert zone, and the Southern Peninsula. Physiologically India is divided ten times. A senior male usually heads families in India. In the senior males household a family can be very large. The senior male†s family can include his unmarried children, married children alongside their wives and kids, unmarried younger brothers and sisters, and married brothers with their wives and children. It is common however for families to separate once the father dies. This idea of family is true for both nuclear family and extended family. As already stated above the size of a typical Indian family is very large. The senior male is responsible for providing the financial assistance to the family while his wife takes care of the house. She assigns chores to all of the females in the household. The Elderly are taken care upon dearly by their family members. The marriage traditions in India have been in existence for a very long time. The have a long and important set of rules that are carefully followed by most. A marriage arrangement is a big responsibility for the parents of both the female and male. A marriage is arranged based primarily on religion, family wealth, and the hope for a good biological reproduction. Marriages in India are no different than in most of the countries around the world. It is a very special event for the bride and grooms family and friends. For both the male and the female marriage is a big change not only socially but mentally as well. Only once married is one truly considered to have made the transition to adulthood. Married couples display a strong for male children. Males are desired more because of financial contribution the may supply for the family. Girls on thew other hand are some times viewed as very big liabilities, The more one has the more liable one is. They are viewed as very expensive to support and require very expensive dowries once they are married. Families that have many girls and very few or no males are in great danger of experiencing financial disaster. The roles played by males and females in the Indian society have a very strong presence. Their roles have changed very little in the last couple of decades. Males are the dominant sex in the society. Females have very little power or control over their lives. The male†s main role is to provide financial stability. India†s educational system is one that is very similar to that held by the British. It consists of five levels of education. Level one is preprimary, followed by primary (which in the American system would equal grades 1-5), middle class (middle school), secondary (9 and 10 grades), and finally higher levels (11 and 12 grades). India s governments is currently working very hard to make the peoples education a top priority. The Indian government supplies the people with free education, even with free education only about half of the children attend school. It is viewed by the Indian people that it is more important for the males to attend school than it is for the females. Out of the 50 Indian population is illiterate, 66% of these are females. Higher education in India is not very big. Out of all of the people that attend primary and secondary education less than 10% go on to higher education. It†s popularity however is increasing greatly compared to past years. India†s collegiate system is divided into three. One of these three types is the religious college. These are colleges found by politicians and by wealthy families. They did this in order to gain popularity amongst the people. Government colleges constitute the second type; these are colleges that are found on the outskirts of big cities. They lack private investments and are therefor founded by the government. The third type is called Professional colleges. These are colleges that mainly receive both government and private aid. Professional colleges are the beset of colleges to study carriers such as medicine, engineering etc. 2-India Literacy rate is very high in numbers but very low in percentages. They have over 400 million people that can read but this constitutes only about 56% of the population. 1- India runs its government under a constitution created in 1949. The president of India is elected by the parliament and serves a term of five years. The Prime Minster of India is also a very powerful man in this country. It is said that he has more power than the president. Lok Sabah, otherwise know as the Lower House of Parliament is controlled by the ministers. The federal Parliament consists of no more than 250 members. The President appoints twelve of them and most of the others are appointed by their state. The Lower House has no more than 545 members. Just like the president they serve terms that last fore five years. In case of a national emergency the president can overrule any state government.

Segregation and Jim Crow