Project In Physics IV

1. PowerPoint Presentation
(A partial fulfillment in Physics)
Presented By:
Mary Joice Avinante
Orlane Marybhell Dimaunahan
Klarabelle Villafranca
Nikko Samonte
Jonas Villaveza
IV-1
BaStateU ARASOF
Nasugbu Batangas
A.Y.2011-2012

3. What is Light?
 This question has been a puzzle for centuries. People
once thought light was something that traveled from a
person’s eyes to an object and then back again. If
anything blocked the rays from the eyes, the object
could not be seen. Since the 1600’s, scientists have
made many discoveries about light.

4. Light
-An electromagnetic wave, a form of energy that can
travel freely across space.
- an electromagnetic radiation in the wavelength
range extending from about 0.4 micro to about 0.7
micro or perhaps more properly, the visual response to
electromagnetic radiation in this range.
-a transverse wave, meaning that the vibrations are
perpendicular to the motion and speed of the wave.

5. Different Theories About Light
Corpuscular theory
-light consist of tiny particles that travel in straight
lines through space. Sir Isaac Newton called these
particles corpuscles.

6. Wave theory
-Christian Huygens asserts that light is a form of
wave motion sent out by luminous bodies.

7. Electromagnetic theory
-James Clark Maxwell explains that light is the result
of the oscillations of the electrically charged particles
of the atom.

8. Quantum theory
-Max Planck advanced the idea that light is an
energy called photons or quanta which are
transmitted in small bundles or quantities from
luminous bodies and which, upon entering the
eyes, make us able to see.

9. Characterization of light
Polarized light- a form of light that vibrates in
one plane only.

10. Coherent light-is a form of light, the constituent
wave trains of which are emitted by single source and
move in unison. This form of light comes from laser.

11. Interference
- phenomenon of light or any other types of waves
in which two or more waves can combine to yield a
resultant wave whose amplitude or intensity maybe
greater or less than the component wave.

12. Types of Interference
 Constructive Interference
-the two crest add together to give a larger crest. It
gives a brighter light than either wave would have
separately.
 Destructive Interference
-the trough reduces the height of the
crest, leaving the spot dim or even dark.

14. Sources of Light
Natural sources of light
Sun
Stars

15. Artificial Sources of Light
Electric light bulbs
Neon Signs

16. Candle
Fluorescent tubes

17. Different Laws
 Law of Reflection
-when light strikes an object, it may be
reflected, absorbed or refracted depending upon the
nature of the surface of the material.

18.  Law of Refraction
-when a light ray passes obliquely from one
medium to a more dense optical medium, it is bent
toward the normal.

19. How is light wave transmitted?
 Transparent body
-one which transmits light readily
 Translucent body
-one which transmits some light, but much of the
light scattered or diffused.
 Opaque body
-one which does not allow or transmit light at all.

20. The
PEOPLE
behind
this
PRESENTATION: