The light got snuffed out....

Geometric Optics. Heck, I was never good at Geometry. Starting out on concave and convex mirrors. It looked hard to understand at first but it seems a little bit easier now. For the sake of achieving enlightment! I can do this! >Yeah!!<

Here are some important terms to remember:

> center (C) - the center of the spherical mirror

>focal point (F) - the point between the center and the mirror

>vertex - middle part of the mirror

>principal axis - the horizontal line drawn from the vertex of the mirror

Steps for the Ray Diagram of Concave Mirrors:
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.

2. From the first incident ray, draw a line passing through the focal point (as by the one of the laws of reflection of concave mirrors). From the second incident ray, draw a line parallel to the principal axis.

3. The point where the two rays of reflection intersect is where the tip of the image is. Just draw a perpendicular line connecting the point of intersection and the principal axis and tadah!!! We have an image! That's an example of an object located beyond C. The following pictures are for other locations of the object:

Note: You can extend the reflected rays until you get an intersection.

Steps for Ray Method of Convex Mirrors:

1. Draw a line parallel to the principal axis from the tip of the object to the mirror. Draw another line (that if extended, would pass through the focal point, which in this case, would be on the other side of the mirror) to the mirror. 2. As by the two laws of reflection of convex mirrors, from the first incident ray, draw a line straight up or perpendicular to the principal axis. From the point of the second incident ray touching the mirror, draw a line parallel to the principal axis. 3. To get an intersection, extend the rays.

4. The point of intersection is the tip of the object. Just draw a perpendicular line connecting it and the principal axis.

credits for the pictures go to: http://www.physicsclassroom.com/Class/refln/U13L4b.html

Happy Days are Here Again

I do so absolutely LOVE this week!!! I'm having a great time! Well, the "family day" was cancelled. We are studying Optics, which so far, is my favorite topic. Quiz one on Optics: 15out of15 (well it was a review). And it was the first time i understood the lessons one week straight! >Hyper mode< If this keeps up, I'll be high till the exams on August.

Seven Days

Day 1: <6-25> Quiz. I never thought that I could do it but I got 5 out of 5! I did it! Gosh, I think I'm gonna cry..

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.