Thursday, August 9, 2007
Fiber Optics
How do they transport information anyway?
First of all, we have to know what are the parts of an optic fiber.
Core - this is where the signals travel
Cladding - the thing that reflects signals bck into the core
Buffer coating - outer covering and protection from harsh elements such as moisture which
can destroy the connection
Jacket - holds single optic fiber together
The key here is internal reflection. Yes, reflection *groan*. The information is transmitted as signals, see? So, have you seen a light from laser? The light that goes in a straight path? If you turned it on in a room full of mirrors, the light bounces of to the next mirror, to the next one, so on, so forth, right? Well, signals are like that; they look like "concentrated light rays". Bouncing off the cladding into the core to travel great distances. Th principle used is total internal reflection.
Um... For the meantime, I'll try to understand this principle and tell you about it next time. I need to study for the exams... Ehenh..
Friday, August 3, 2007
Lenses
Steps for Ray Method for Diverging Lenses:
1. From the tip of the object, draw the first ray parallel to the principal axis. Draw a second ray that if extended would pass through the focal point of the back side of the mirror. Draw a third ray passing through the vertex.
3. To get an intersection, jut extend the rays of refraction, thet connect the intersection to the principal axis with a perpendicular line, and tadah!!!! There's your image!
credits for the pictures goes to: http://www.glenbrook.k12.il.us/gbssci/phys/Class/refrn/u14l5ea.html
Wednesday, July 25, 2007
The light got snuffed out....
1. From the tip of the object, draw a line parallel to the principal axis to the mirror. Then, draw another line from the tip of the object to the mirror but this time, the line must pass through the focal point.
Steps for Ray Method of Convex Mirrors:
credits for the pictures go to: http://www.physicsclassroom.com/Class/refln/U13L4b.html
Friday, July 20, 2007
Happy Days are Here Again
Tuesday, July 3, 2007
Seven Days
Day 2: <6-26> Quiz. Three out of five this time. Drat... Failed. Our lesson for today was the speed of waves on a string. You get it by getting the square root of the tension over mu. *Mu is a Greek letter which is equal to mass over length.
Day 3: <6-27> First quiz for the day, I got 2 out of five because I got the formulas the other way around. *idiot* Hakk!! He knows! He knows! Sir Mendoza knows our names! *time to wear masks and/or hide!* Second quiz for the day I got five out of five.
Day 4: <6-28> First time anybody (probably) ever saw Mr. Mendoza not smiling. Ohhhh... The atmosphere was creepier than before, let me tell you.. We did an activity about waves: drawing the effects when destructive or constructive waves meet.
Day 5: <6-29> Just the checking of the activity yesterday.
Day 6: <7-2> Sound Waves. Harder, but fun nonetheless. To get the speed of a sound wave get the square root of the elastic property over inertial property. The elastic property can be the Bulk modulus (for speed of sound waves in liquids) or Young's modulus (for speed of sound waves in solids). The inertial property, which is represented by "rho", is also the density of the medium.
Day 7: <7-3> Brain-bleeding practice.
Sunday, June 24, 2007
Of Mirrors, Waves, and Illusions....
Remember: Passing is ALWAYS 85%!! SO Do your best! Fight! Review!
The project was given last Friday. "Life of a Mirror" music video. Cool...
Wednesday, June 20, 2007
Today is My Lucky Day
I understood the lesson (finally!) AND got a perfect score on the quiz (5 out of 5, a personal record). The lesson was about the Law of Reflection. It was so fun...
I'm looking forward to tomorrow!
Friday, June 15, 2007
Second Week Completed, Please Move to the Next
Three topics in one week... No wonder I---ahahahaah.....
SOHCAHTOA. A lot more easier now, after I reset my scientific calculator twice. I kept getting different answers from the others. I even asked asked someone else to doit on my calculator. Darn... Lost points...
Vectors. I was finally able to understand it after getting zeros in two quizzes. Ahaha.... Here's gow to do it:
A. Graphical Method
1.Determine the scale and frame that you are going to use. The frame is optional but it makes work a bit easier (for me, at least).
2. From the point of origin, draw the first vector. From the head of the first vector, draw the second vector. From the head of the second vector, draw the third vector. So on, so forth... Just make sure that the vectors are connected in a head-to-tail manner.
3. From the point of origin, draw aline to the head of the last vector drawn. This is the resultant vector.
4. To get the direction, use a protractor. To get the magnitude, measure the length of the resultant vector then convert using the scale you chose.
Will be posting the Component method soon. It's a lot easier than graphical. Just... alittle bit harder to put into words....
Saturday, June 9, 2007
Firsts
SOH CAH TOA. I only managed to understood the lesson after being explained about five times by my classmate. Somehow, I forgot to edit my assignment. The next lesson was about using the graphic method to get the resultant vector which is more complicated than it looks. I'll stop here because I still need to stare and understand how it's supposed to happen.