Refraction Essay Example for Free

Refraction Essay Refraction BY gupta979 Refraction refers to the bending of the transmitted light at the interface between two transparent materials. The angle of refraction depends on the angle of incidence and the relative speeds of the light in the two different media and can be found from the relationship [pic] From this equation we see that the direction in which the light is bent depends on whether it is going from a slower to a faster medium or vice versa. Index of refraction The index of refraction of a medium is defined as the ratio of the speed of light in vacuum to the speed of light in the medium. By definition, n = 1 in vacuum. In all materials n 1. The frequency of light does not change as it goes from one a medium of one index of refraction to another. This means that the wavelength changes with the speed. Thus, the wavelength is smaller in a medium than in vacuum. From the definition of the index of refraction, we can rewrite the relationship etween the incident and refracted angles as or This equation is known as Snells law of refraction. Example The index of refraction of a glass is n = 1. 6. A ray of light is incident upon the glass surface at an angle of 300. What is the angle of refraction into the glass? Solution: approximately n If the wavelength of the light in air is 520 nm (green), what is its wavelength in the glass? What is the frequency of the light? (2 slow fast incident reflected refracted

Television and Media Essay - Four Arguments for the Elimination of TV

Four Arguments for the Elimination of Television Television technology has been a controversial issue since its debut in the early 1940s. In order to fully understand any controversial issue, one must be presented with both the pro and the con sides of the issue. One must understand and be able to argue both sides of the issue in order to become a successful and well-educated person. Being a member of the pro-technological society, one is well educated on the pro side of this issue. That is, the positive effects that television technology has on society: Television's entertainment value, the ability to get "up to the minute" news coverage from around the world, and the uses of television as an educational tool. In order to understand the con side of this issue, one can look at the work Four Arguments for the Elimination of Television, by Jerry Mander. This work provides four strong arguments against the television technology and gives reasons why the technology should be eradicated. Through the study of this work, one c an become better equipped to argue the con side of the issue, thus becoming a well-educated member of society, conscious of the effects that television has on him/her. Mander was a poor child growing up in the Lower East Side of New York City. His parents were immigrants who had escaped from pogroms in Eastern Europe. His father did many odd jobs during their initial years in America. He worked hard at anything in order to keep life together. His father's success came to him during World War II. He was beyond the draft age, and so he was able to do successful trade business in manufacturing uniforms for the military. When it was time for Mander to pick a career... ...make lots of money. As a consequence, television must present its information in the least amount of time as possible. Thus, information must be edited and re-edited until this condition is met. The quality of the information suffers because of this. As one can see, the argument against television is as strong, if not stronger, then the arguments for television. As a result, one can now better understand both sides of this controversial issue and make an informed argument for or against television. At this point, one is conscious to the many manipulations of television, advertising, and corporations. Being aware of these factors, one is now equipped to ask themselves "why do I do the things I do?". The answer being: Television. Works Cited Mander, Jerry. Four Arguments for the Elimination of Television. New York: Quill, 1978.

Advantages and Disadvantages of Drugs Usage Essay

: Advantages and Disadvantages of Drugs Usage Good morning to our teacher Pn. Devi and our friends. I am chien yen. I am Wan Yi. We are honoured to give a talk on advantages and disadvantages of drug usage. I probably don’t have to work very hard to get people to see that there really is no right time, place, or situation to try drugs, but I’m going to try anyway. There are several different reasons why teens might turn to drugs . One of them could be that they just want to be social and have fun. Usually, it is in a social setting that teens first try drugs. The â€Å"teen years† is when most adolescents do their experimenting with different things, and this could also be another reason why they might try drugs. They also might be mislead to think that addiction couldn’t happen to them, so â€Å"I can stop whenever I want† is often an excuse. Another reason could be that they want to seem mature, or cool. Many teens think that using drugs make them seem more grown-up and confident, but in fact, it shows just how immature they are. By giving into peer pressure and not being able to think for themselves, the only thing they prove is that they are naive. Everybody knows that parents are big influence in child’s life, but sometimes children might feel pressured or controlled by their parents and decide to rebel against them. Using drugs is a very common way of rebelling because the parents might not even know that it’s going on right under their noses. School, friends, relationships, and many other things could also be adding to the stress of teens today, and the pressure alone might drive them to drugs because they think it’s comforting. The truth is that it adds more stress to their lives in the long run. There are many dangers that come along with drug use. The greatest danger is death, but there are several other risks and consequences that should definitely be taken into consideration. Drugs can cause addiction, brain damage, liver failure, and many other serious health problems. The use of drugs can also impact the user’s family and friends. They can be dragged into the user’s problem and get addicted themselves. The user could also end up being abandoned by his or her family and friends because nobody really wants to be around drug users. There are so many benefits that come along with a drug free lifestyle. I think most people probably already know the major benefit†¦ life. I believe life is too short to waste time worrying about the consequences of doing drugs. Teenagers are stressed enough these days with work, school, family, and friends that we don’t need any additional reasons to be stressed or feel overwhelmed. Life is hard sometimes, but the misconception that drugs will make it better just makes it that much worse. Another benefit of drug free lifestyle is having a completely functional brain. School is hard for many teenagers, and they have to struggle to get by, so add drugs into the equation, and it makes school that much harder. Then what happens if the person decides that school is too hard? They give up, and live the rest of their life poor because they never finished high school and can’t get a decent job. There’s also the fact that there would be a lost less money spent on medical bills. Tobacco causes cancer, alcohol causes liver problem, inhalants cause brain damage, and all of the other drugs have their health issues also. If they were no drugs, there wouldn’t be as many health problems. If there weren’t as many health problems, there wouldn’t be as much money spent at the hospital. If there was less money spent at the hospital, the doctors might be mad, but the person’s life would be so much better overall! Seriously, not doing drugs can prevent a number of health problems. Overall, there is never a right time, place, or situation to use drugs. Also, almost all the reasons that teens might use drugs are just misconceptions. This doesn’t only go got teenagers. Many adults use drugs , and the same risks apply to adult drug users.

My Transition From High School - 1327 Words

My transition from high school to college was the most difficult adjustment I have ever undergone as an eighteen year old. It was a different experience because I came from a majority Black high school to a predominantly White institution; I was overwhelmed and I felt out of place. I often compared myself to White counterparts; I never felt smart or good enough. Now I know, as Steve Furtick phrases it, that I was comparing my â€Å"behind the scene† with everyone else’s â€Å"highlight reel,† and that was self-damaging. In addition, I was preoccupied with what my friends from home were doing that I isolated myself from everyone on campus. Mentally I felt defeated, spiritually I felt alone and physically I was gaining weight rapidly and was†¦show more content†¦The group I led with Kim consisted of four female ex-offenders who all had been victims of abuse. Their reasons for incarceration were alcohol abuse, drug abuse, and acts of violence. What was most disturbing to me was meeting the one woman who had been imprisoned for killing her baby. I was a little uneasy because of the pasts of these women. As the newest member of the group, I did not know how they would react to me being there. This session, we focused on short and long-term life goals. The women were very open with me; they discussed a lot about their pasts and their plans for the future. I lead a majority of the group discussion, initiated a few role-play activities, and administered a self-esteem test. I was proud that I could observe, give feedback, and encourage these women. I know that they appreciated my presence, and I felt good about myself. What I appreciate most about working with these women was that they were, positive, open, and honest. The women had an authenticity about them that I admired. Although I do not agree with the crimes that these women committed, this experience increased my own self-awareness. 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