Tomorrow is the big day!!!
Long Test na bukas!!!!
Have to study!!! study!!! and Study!!!
Kailangan ipasa!!!

long test longtest longtest long test long test long test....
aral aral aral aral aral aral aral aral aral aral aral aral aral ....

Wohoohoo!!! Go!!


[sana di mahirap! hehe.. aral!!!]

Sir, I know po that you were not satisfied with our last two presentations... and I know that we deserve our grade.

Those presentations were a result of our last minute preperations and cramming(what's new?!). Yes it was given a month before the day of the presentation, but like the usaul... kung kelan malapit na ang deadline dun palang nagstart ng practise. we didn't give it our 100% effort for this project... Even we know that we alot of catching up to do for an improvement this 2nd quater, we just let that opportunity to pass by.

Sir sorry if we ruin your day... and thank you po for giving us another chance.
We will not waste the second chance that you gave us (hope so...)

Salamat po ulit ^^,

I'm having a good start this 2nd quarter!!!
our lesson are not that hard unlike last quarter... I actually understand every lesson.
And haven't got any zero's on our quiz!

Our lesson was about radiation... all about it! from its benifits, effects to humans, the alpha, beta particles and the gamma rays... balancing formulas... isotopes... radioactivity.. half life.

we also learned the people behind the numerous discoveries in Nuclear physics like Henri Becquerel, Marie Curie and the father of Nuclear Physics... Sir Ernest Rutherford.

The calculation that we are having was not that hard to understand and not that complicated. we have calculated for the bending energy, mass defect, radioactivity of an isotope, its half life.

I think that I will have a good future this second quarter!!! YEAH!! ^^,

What are their Difference?


I have read in a book that there is a big similarities between the eye and the camera, specially in the functions.
Both the camera and the human eye has the same kind of lens. It is both Converging. They both magnify the things that we see. Both of the lenses can focus to thing same distance with it but can only focus one at a time.



In focusing objects the human eye and camera differs because when and objects move closer to the lens, the lens move and adjusts keep the object in focus. but the human eye cannot move and do just like that of the camera, instead the ciliary muscles change the shape of the lens by making the lens bulge in the middle if the image comes closer to you and stretch if the object is further away. This is done so that the eyeball isn't stretched. The process of changing the shape of the lens is called ACCOMODATION. This is why most old people use glasses or reading glasses because the muscles gets stiffer and losses it ability to change shape when focusing in an object.

REMEMBER:
The shortest distance at which an object is in focus is called the near point of the eye, which is for a normal adult is about 25 cm. And the longest distance is called the far point of the eye

If the camera have its film that traps the light to form a permanent image, the human eye on the other hand has it retina. The retina has this CONES and RODS that send the information that was sensed by the eye and transmits it to the brain.The rods tell your brain if there’s light in a certain spot or not and the cones tell your brain what color the light is. However, there is some spot in the retina that is called the blind spot this was the reason why humans have two eyes or lenses. Since the camera doesn't have a blind spot, it only requires one lens.






Both the human eye and the camera can control the amount of light that passes through.
The human eye has its Iris and the pupil the changes in size depending on the amount of light. while in the camera the diaphragm controls the aperture (opening) of the lens and the shutter limits the passage of light.

===>>> Amazing! ang galing!!! ^_^ Hindi ko alam na parang Camera din pala 'tong mata natin. Yung sa Camera permanent image nga lang. Nakakatuwang malaman yung mga information na ito... kasi parang dati hindi ko lang pinapansin... pero nung nagkapagbasa-basa na ako about sa assignment amaze na amaze talaga ako. Kahit may konting pagkakaiba... mapapahanga ka talaga sa mga taong nagimbento nitong camera parang "artificial eye". ^_^

• 
  Any incident ray traveling parallel to the principal axis of a diverging lens will refract through the lens and its extension is in line with the focal point


• 
  Any incident ray traveling towards the focal point on the way to the lens will refract through the lens and its extension is parallel to the principal axis.


• 
  An incident ray which passes through the center of the lens will in effect continue in the same direction that it had when it entered the lens.
  

Ray Diagram for Converging lenses:

• Determine the top most part of the object then draw the three rays- ray parallel to the principal axis, ray passing throught the fical point and ray pasing at the center.


• Follow the Rules for Refection of Diverging lenses: the ray parallel to the principal axis will be refracted in the lens and its extension should pass the focal point.the ray passing the focal length will be refracted by the lens and its extension should be parallel to the principal axis and the ray passing through the lens without changing its direction.


• and their intersection is the top most part of your object.
  

1. 
   

   
   

2. 


3. 
   
   

Rules for Refraction of Converging lens:

• A ray parallel to the principal axis will be refracted on the opposite if the lense passing through the focal point.


• A ray passing through the focal point will be refracted on the opposite side of the lens parallel to the principal axis.


• An incident ray which passes through the center of the lens will in effect continue in the same direction that it had when it entered the lens.
  

Ray diagram for Converging lens:

• draw the three rays that is parallel to the principal axis, passing through the center of the lens and the ray passing throught the focal point.


• Follow the rules for the refraction of the converging lens. the ray parallel to the principal axis will be refracted on the opposite side of the lenses passing through the focal point. the ray passing through the center will be refracted at the same direction and the ray passing through the focal point will be refracted on the opposite side of the lens parallel to the principal axis.



• and the their intersection is the location of the top most part of the object.

1. 
   
   
2. 
   
3. 

Using the ray diagram we could find the location of the object, we could know if the image is inverted or upright, enlarged or decreased in size and if it is a virtual or real image. All of these will depend to the distance of the object from the mirror.

Ray Diagram for concave mirror:

1. Decide the location of the object.
   


2. at the top of the object draw a line parallel to the principal axis and another line that would pass through the focal point.
   

*there should be an arrow head for every ray to indicate the location to where it is going.*

3. after drawing the incident rays, draw the reflected rays. rules for the reflection of concave mirror should be followed. this suggests that ray the is parallel to the principal axis would be refected passing through the focal point and the ray passing though the focal point will be reflected parallel to the principal axis. and their intersection would be the location of the top part of the object.

4. after drawing the top part of the object, connect it perpendicular to the principal axis.

Ray diagram for Convex Mirror:

• determine the distance of your object. at the top most part of the object, draw a ray parallel to the principal axis and another line that is passing through the focal length.



• the line parallel to the principal axis will be reflected and its extension should pass the focal point. and the line that passed through the focal point will be reflected parallel to the principal axis and its extension parallel to the principal axis also.

• Their intersection is the location of the topmost part of the object .