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Saturday, August 25, 2007
The periodic test is now a history, but still, I have a hangover regarding the result of my exam. Tsk tsk.
21 out of..err? [ano nga b?]
But I'm still happy though. I know that it was my best.
Now, my problem is the 'call parent thinggy', I know that I'm one of them. :]
And going to the robot fest is a must! I need extra points, my dear :]
5:24 AM
Love Lots, Monique
Friday, August 10, 2007
2:54 AM
Love Lots, Monique
A technology that uses glass (or glass) thread (fibers) to transmit data. A fiber optic cable consists of a bundle of glass threads, each of which is capable of transmitting messages modulated onto light waves.
Fiber optics has several advantages over traditional metal communications lines:
-Fiber optic cables have a much greater bandwidth than metal cables. This means that they carry more data.
-Fiber optic cables are less susceptible than metal cables to interference.
-Fiber optic cables are much thinner and lighter than metal wires.
-Data can be transmitted digitally (the natural form of computer data) rather than analogically.
The main disadvantage of fiber optics is that the cables are expensive to install. In addition, they are more fragile than wire and are more difficult to splice.
Fiber optics is a particularly popular technology for local-area networks. In addition, telephone companies are steadily replacing traditional telephone lines with fiber optic cables.
[Article from www.wobopedia.com]
2:23 AM
Love Lots, Monique
Thursday, August 9, 2007
Converging
First, draw an incident ray parallel to the main axis, then extend the reflected ray. [Make sure that it will pass through the focal point behnd the lens] Next, draw a ray that will pass through the focal point, when it reaches the lens, extend it parallel to the main axis. Do the same thing on the tail of the object. Connect the intersection and that will be your image.
Diverging
Draw three incident rays travelling towards the lens. Then, refract them according to the three rules of refraction. Extend their reflections to get the intersection. Do tha same thing for the other side. Connect the intersections.
**RULES of REFRACTION**
-Any incident ray travelling parallel to the principal axis of a diverging lens will refract through the lens and travel in line with the focal point (in a dirction such that its extension will pass through the focal point0.
-Any incident ray travelling towards the foacal point on the way to the lens will refract through the lens and travel parallel through the main axis.
-Any incident ray passing through the center of the lens will in effect continue in the same direction that it had when it entered the lens.
3:22 AM
Love Lots, Monique
Concave
First, draw a line from the tip of the object parallel to the main axis and the reflected light will pass through the focal point. Then draw the second line passing through the focal point and the reflection must be parallel to the main axis. The intersection of the reflections will be the head of of the image. Do the same thing for the tail and connect the intersection. That will be the image. :]
Convex
First, draw a line parallel to the main axis, make sure the extension of the reflected light will pass through the focal point behind the mirror. Next, draw a line from the tip of the object that will pass through the focal point behind the mirror, since it will be reflected by the mirror, extend its reflection. Lastly, connect the two intersections and that will be your image. :]
2:57 AM
Love Lots, Monique
2:34 AM
Love Lots, Monique
Our eyes and the camera works the same. How? Let's find out.
The essential elements of a camera are a lens equipped with a shutter, a light-tight enclosure, and a light-sensitive film to record an image. For the eyes, it's the retina, pupil, iris and cornea.
The lens of the camera forms an inverted real image on the film of the object being photographed, just as the lens of the human eye forms a real image on the retina, the eye's "film". The lens may be removed closer to or farther from the film to provide proper image distances for various object distances. As for the eyes, the refraction at the cornea and the surfaces of the lens produces a real inverted image of the object being viewed; the image is formed on the light-sensitive retina, lining the rear inner surface of the eye. The rods and cones in the retina act like an array of miniature photocells; they sense the image and transmit it via the optic nerve to the brain.
1:37 AM
Love Lots, Monique