Undergraduate Students Views on Social Links and Their Influence on Motivation

Ray tracing Essays

Ray tracing Essays Ray tracing Essay Ray tracing Essay The objective of this experiment is to find the length of an object and its focal lengths. I will first try to hypothesize where the length points will be. The given results of my hypothesized diagrams will determine the lengths of the focal points. I will then be able to find out where the object image will be situated by following my ray trace diagrams. I believe that I will be able to find the length of the object image if I can find the two focal length points ( 1/v and 1/u displayed in my ray trace diagrams and the focal graph). To achieve this I have decided that I could not get an accurate hypothesis if I did not know this information, so I will carry out a small practical experiment. We found that if the lens is thin, the focal length is longer, and if it is thicker, the focal length is smaller. The focal length for our lens is 10cm. I have created some ray tracing diagrams to show my predicted lengths using the focal length that I found. I have found the longest distance that I can get a clear image is 100cm, the shortest being 15cm. I then carried out an experiment to prove my hypothesis. I used light boxes to create a light source, but this is not extremely accurate as the light rays diverge and are not parallel. I used a screen and a lens to try to find an image. My results for my experiment were as follows. I had three atempts to make my experiment more accurate. Image lens Lens Screen Image size (cm) 1st/2nd/3rd attempt (cm) 1st/2nd/3rd attempt (mm) 15 33/35/36.5 25/28/29 25 18/18/18.5 9/9/9 40 15/14/15 5/5/4 50 14/13.5/13.5 3/3/3.5 60 13.5/13/13.5 2.5/2.5/2.5 80 12.5/12.5/12.5 1/1/1.5 100 12/12/12.5 1/1/1 I have found the averages of the 3 attempts and have also put these in a table. Image lens Lens Screen Image size (cm) Average(to 2dp, cm) Average (to 1dp, mm) 15 34.80 27.3 25 18.17 9 40 14.67 4.7 50 13.67 3.2 60 13.33 2.5 80 12.50 1.3 100 12.17 1 This data is represented in a graph. It shows that the longer you move the object to the lens away, the less distance between the screen to the lens is needed to get a clear image. The further the object to the lens is the smaller the image size. The only problems that I had with my experiment were the fact that the light rays were not perfectly parallel. This could of lead to the rays moving away from the focal points, and could then move the object image a few millimeters, which could change the results by a lot. The other problem was the materials. These were not of a high quality, and the measuring devices we used were 1 meter rulers, which were not accurate enough to the millimeter. We also did not know what thickness the lenses were, so we could not go into further detail into the changes, which they may have caused. Overall the experiment was a success. It showed basically what my raytracing diagrams, and my hypothesis had shown. It gave a clear, precise trend on how the lengths change. Changing with size it shows the further you pull the object from the lens, the shorter length you have to put the lens from the screen.

Network topology design & layout Essay Example | Topics and Well Written Essays - 1000 words

Network topology design & layout - Essay Example The company will also need two WWW servers so that one is for its internal management and another for external users. Furthermore, a mail server will also be crucial in this case. For the sake of ABC company security, it is crucial that outsiders should not gain access to the internal CVS or internal WWW servers whatsoever. For a start-up open source software company as the company ABC, it would be a great challenge to fully implement an effectively secured network. In this study we therefore purpose to realize the company with the above specifications. Below is a graphical representation of the network design layout. It is very risky running an entire company on a personal computer. The ABC Company needs to watch over servers that handle the web based systems with advanced expertise. Such servers in this case include CVS and WWW servers. In terms of security assumptions, it is important for the company to make its security appear good as argued by Cheswick et al (2003) that this is enough to deter attackers. It is also important to make simple security arrangement since complex things are harder to comprehend and might even be nightmare to their designer (Cheswick et al, 2003, pp.5). For a young company as ABC, it would be inappropriate to use huge security-sensitive programs because in most cases such programs have acted as sources of security problems. Furthermore, the companys network designer must keep security assumptions in mind and see to it that the security is an integral part of the original design. Let us begin by considering this typical policy: Internal users are trusted, and with permitted Internet access they are able to initiate ongoing TCP connections, issue DNS queries, be able to run ping trace-route and set their clock aided by external time server (Cheswick et al, 2003, pp.5). Secondly, the outsiders should not be able to initiate access to the internal world.