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CLICK ON IMAGES ABOVE TO NAVIGATE!
If you LOVE someone, get it
If you HATE someone, don't mind it
If you love PHYSICS, go fot it
but be sure you can make it...
make your BEST out of it
TOP 10 RULES in PHYSICS BLOG
1. Choose the best blog maker
for your physics blog
2. Make a beautiful blog to attract them
3. Complete all the given requirements
eg. name, likes, dislikes etc.
4. Try to update it at least once a week
or if there is something important thing
that happend on that day on your physics room
post it on your blog
5. If you want to put pictures,
be sure that most of it
are connected to physics
6. If you want to put some effects,
eg. music, date etc.
as much as possible it is
also within the physics subject
7. When you are in the other physics blog,
please put your comments on their tagboard,
if you don't post any comment
then you will not also receive
any comments from them
in short.....
in every action there is
an equal and the same reaction
8. If there are some people
who helped to work on your blog
put their acknowledgement
9. Make a main physics blogsite of your
section so that it is easy
for your teacher to check
your physics blog
10. Please, do not frequently
copy and paste because
it is a crime
as i entered the PHYSICS room...
Wednesday, August 8, 2007
:
Camera and Eyes...
Similarities
1.
function: opening for light to enter
part of the camera: aperture
part of the eye: pupil
2.
function: control the amount of light entering camera/eye
part of the camera: diaphragm control size of aperture
part of the eye: iris muscles control size of pupil
3.
function: refract light
part of the camera: glass biconvex lens
part of the eye: mainly cornea ; lens, aqueous & vitreous humor
4.
function: object of light action to form image
part of the camera: photosensitive chemicals on film
part of the eye: photoreceptors(rods & cones) in retina
5.
function: absorb excessive light to prevent multiple images formation
part of the camera: dark internal surface
part of the eye: pigmented, dark choroid
Difference
1.
function: focusing mechanism
on the camera: change distance between lens and film
on the eye: change focal length of lens using ciliary muscles
WhO aM I?... reads his PHYSICS BOOKS @: 8:49 AM
:
FIBER OPTICS1. The science or technology of light transmission through very fine, flexible glass or plastic fibers.
2. A bundle of optical fibers.
Parts and Function of the Fiber Optics
Core - Thin glass center of the fiber where the light travels
Cladding - Outer optical material surrounding the core that reflects the light back into the core Buffer coating - Plastic coating that protects the fiber from damage and moisture
How Does it work?
Fiber-optic transmission of light depends on preventing light from escaping from the fiber. When a beam of light encounters a boundary between two transparent substances, some of the light is normally reflected, while the rest passes into the new substance. How much of the beam is reflected, and how much enters the second substance, depends on the angle at which the light strikes the boundary. When the Sun shines down on the ocean from directly overhead, for example, much of its light penetrates the water. When the Sun is setting, however, its light strikes the surface of the water at a shallow angle, and most of it is reflected. Fiber optics makes use of certain special conditions, under which all of the light encountering the surface between two materials is reflected, to reduce loss.
A principle called total internal reflection allows optical fibers to retain the light they carry. When light passes from a dense substance into a less dense substance, there is an angle, called the critical angle, beyond which 100 percent of the light is reflected from the surface between substances. Total internal reflection occurs when light strikes the boundary between substances at an angle greater than the critical angle. An optical-fiber core is clad (coated) by a lower density glass layer. Light traveling inside the core of an optical fiber strikes the outside surface at an angle of incidence greater than the critical angle so that all the light is reflected toward the inside of the fiber without loss. As long as the fiber is not curved too sharply, light traveling inside cannot strike the outer surface at less than the critical angle. Thus, light can be transmitted over long distances by being reflected inward thousands of times with no loss.
Credits:
Picture: http://electronics.howstuffworks.com/fiber-optic1.htm
Definition of Fiber Optics: Answers.com
How Does it work?: Encarta 2007 (some are paraphrase)
WhO aM I?... reads his PHYSICS BOOKS @: 7:49 AM
Continuation of Lenses...
:
Diverging Lense
Ray Diagram
1. Draw 3 lines, first line is parallel to the principal axis, 2nd line is passing through the focal point on the right side of the diverging lense and the 3rd line is passing through the vertex.
2. The reflected line of the 1st line is passing through the focal point and extend, the reflected line of the 2nd line is parallel to the principal axis and the 3rd line's reflected line is extended to the vertex.
3. The point of intersection is the place of the tip of the line
4. And that is your image... :D
thank you very much for the photos http://www.glenbrook.k12.il.us/gbssci/phys/Class/refrn/u14l5ea.html
WhO aM I?... reads his PHYSICS BOOKS @: 7:34 AM
Tuesday, August 7, 2007
Lenses...
:
Converging Lense
Steps of Ray Method of Converging Lense
1. Draw 3 lines, the first line is parallel to the principal axis, the second line is passing through the vertex and the third line is passing through the focal point.
2. The first line (parallel to the principal axis) should pass the focal point. Extend the second line (passing through vertex). The third line (passing through vertex) should be parallel to the principal line.
3. The point of intersection is the place where the tip of the line is place.
The images that you will see will give you the idea of the position and the image of the object when it is place on the other location.
thank you very to http://www.glenbrook.k12.il.us/gbssci/phys/Class/refrn/u14l5da.html for the pictures :P
WhO aM I?... reads his PHYSICS BOOKS @: 7:07 PM
Monday, August 6, 2007
continuation...
:
CONVEX MIRROR
The way how to do it is the same with the concave mirror but the difference between them is the location of the sphere... the positions of the image formed in the concave is opposite to the convex... :D that's all... hope you learned something... hehe
WhO aM I?... reads his PHYSICS BOOKS @: 7:04 AM
Sunday, August 5, 2007
SALAMIN, tara usap tayo... :D
:
CONCAVE MIRROR
Ray Diagram for Concave Mirror
1. Pick a point on the top of the object and draw two incident rays traveling towards the mirror, one is parallel to the principal axis and the other one is passing through the F.
2. Make a line passing through the point F from the endpoint of the parallel line. For the line passing through the F, make a line parallel to the principal axis.
3. Mark the image of the top of the object. The image point of the top of the object is the point where the two reflected rays intersect.
4. Repeat the process for the bottom of the object. Since the endpoint of the arrow lies on the principal axis, the endpoint of the arrow is in the principal axis also.
Object beyond curvature
Object in the curvature
Object between curvature and focal point
Object between the focal point and the mirror
Object in the focal point
WhO aM I?... reads his PHYSICS BOOKS @: 5:14 AM
