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Sunday, August 12, 2007
Since I was told that my last entry was incomplete, here goes what's neede -the ray diagrams. The past post only were the steps, so here are the ray diagrams themselves.  Plane Mirror  Concave Mirror  Convex Mirror  Converging Lens  Diverging Lens Thanks to Glenbrook high's Official Website (The Physics Classroom) for the images. The site really is helpful, especially when Physucks times call! :] Labels: Required Post
posted by Karen Ann Labsan at 4:36 AM
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Saturday, August 4, 2007
What are Fiber Optics?
Fiber optics are long, thin, strands of pure glass about the same diameter as the human hair. They are used to transmit light over long distances and arranged in bundles called optical cables.
What are its parts?
Core -Thing glass center where light travels
Cladding -Outer optical material that surrounds the core and reflects light back into it
Buffer coating -Plastic coating which protects the fiber from moisture and being damaged
What are its types?
Single-Mode -Have small cores and transmit infrared laser lights.
Multi-Mode -Have larger cores and transmit infrared light from light-emitting diodes.
How does it transmit light?
The light in an optical cable travels by constantly bouncing from the cladding; total internal reflection. Since the cladding doesn't absorb any light from the core, the light can travel great distances.
So, I guess, I'm done with all the required posts before the upcoming periodic exams... Gotta go, gotta read my Physics book, gotta study, gotta pass the long test... I really have to!
posted by Karen Ann Labsan at 2:09 AM
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COMPARISON OF THE HUMAN EYE AND CAMERA  :] Opening for light to enter...
Eye: Pupil
Camera: Aperture
:] Object of light action to form image...
Eye: Photoreceptors (cones and rods) in retina
Camera: Photosensitive chemicals on films
:] Refracts light...
Eye: Cornea; aqueous and vitroues humor
Camera: Glass biconvex lens
:] Controls the amount of lights...
Eye: Iris muscles
Camera: Diaphragm
:] Focusing mechanism...
Eye: Changes focal length of lens using ciliary muscles
Camera: Changes distance between lens and film
&&&___&&&
There, you go... Next post, 'Fiber Optics', is gonna be up in minutes. :]Labels: Required Post
posted by Karen Ann Labsan at 1:51 AM
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Friday, August 3, 2007
So, I just finished my post on ray diagrams. Oh, that was a long work and I did not do any copy pasting! I read my book and some articles online, and that's all about it... So, don't dare do a copy-paste on mine!!!
Anyways, this coming Monday is our second long test for the first quarter. Hmmm, 'tis gonna be another headache and brain tormenting. Ha. I just want the result of this one to be better than the first which totally sucked. I understand our lessons in mirrors and lenses more than I did with all those sounds-vectors-and-what-not's.
Alright. Here's an update. And this post ends with this ---> :]Labels: Just So I Have an Update
posted by Karen Ann Labsan at 4:23 AM
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So, here goes the procedures of making ray diagrams according to my own understanding... :)
MIRRORS!!!
RAY DIAGRAM FOR CONCAVE MIRROR:
1. Draw a line from the tip of the object parallel to the mirror; the first incident ray.
2. Draw another line from the tip of the object passing throught the focal point; second incident ray.
3. From the first incident ray, draw another line passing throught the focal point; ray of reflection 1.
4. From the second incident ray, draw another line parallel to the main axis used; ray of reflection 2.
5. Now, draw a perpendicular line from the intersection of the two rays of reflection to the main axis. Then, there goes your image!
RAY DIAGRAM FOR CONVEX MIRROR:
1. Draw a line parallel to the main axis from the tip of your object.
2. Draw another line from the tip of the objedct passing through the focal point at the back of the mirror.
3. Draw a line passing the point the first incident ray touches the mirror and also passing throught the focal point at the back.
4. Then, draw another line parallel to the main axis and passing throught the point where the second incident ray touches the mirror.
5. The last two lines drawn should be extended up to the back of the mirror.
6. Now, the intersection of the rays is the tip of your image. Draw a perpendicular line from it to the main axis.
RAY DIAGRAM FOR PLANE MIRROR:
1. Draw a line representing your mirror.
2. Draw an arrow to represent your object.
3. Draw 2 lines from the tip of the arrow to the mirror.
4. Draw another two lines from the other end of the line to the mirror.
5. Get the reflected ray by having the same measure of degrees formed.
6. Connect the rays at the back of the mirror.
7. You should have all the measurements checked for you to have the image correctly placed. :]
LENSES!!!
RAY DIAGRAM FOR CONVERGING LENSES:
1. First incident ray: Draw a parallel line from the tip of the object to the lens.
2. Second incident ray: Draw a line from the tip of the object to the center of the lens, or the intersection of your axes.
3. Third incident ray: Draw a line from the tip of the object passing throught the focal point in front of the lens.
4. Draw a line from the the point where the first incident ray touches the lens to the focal point at the back of the lens.
5. Extend the second incident ray up to the back of the lens.
6. Draw a line parallel to the main axis from the tip of the third incident ray.
7. The intersection of the extension of the 3 rays is the tip of your image. Draw a perpendicular line from it to the main axis. Now, you get the image!
RAY DIAGRAM FOR DIVERGING LENSES:
1. First incident ray: Parallel line to axis, from tip to the lens.
2. Second incident ray: Draw a line from the tip of the object to the center of the lens, or the intersection of your axes.
3. Third incident ray: Draw a line from the tip of the object to the focal point at the back of the lens.
4. Draw a line passing through the focal point in front of the lens and passing through the point the first ray of incidence touches the lens.
5. From the point where the second incident ray meets the lens, draw a line parallel to the main axis.
6. Just extend the third incident ray.
7. Now, see where the 3 extensions intersect? There's the point that is the tip of your image. Draw a perpendicular line from the axis to the intersection, and, yeah, the image!
Whew! That was a long one!!!Labels: Required Post
posted by Karen Ann Labsan at 3:01 AM
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