Light behaves as both a particle and a wave, traveling at approximately 300,000 km/s and demonstrating properties such as refraction and color perception. Key concepts include the bending of light at media boundaries, which affects how objects appear under different conditions, and the role of the human eye in distinguishing colors. The perception of color is influenced by the light reflected by objects, with white light containing all colors and black objects absorbing them.

2.  Behaves like a particle and a wave.
 Is a radiant energy, usually referring
to electromagnetic radiation that is
visible to the human eye.

3.  Proposed by James Clark Maxwell
 He showed that electric and magnetic
fields were propagated together and
that their speed was identical with
the speed of light.

5.  Travels very fast – around 300, 000
km/s.
 Travels very fast in straight lines.
Laser

6.  Light travels much faster than sound.
1) Thunder and lightning
start at the same time,
but we will see the
lightning first.
2) When a starting pistol is
fired we see the smoke
first and then hear the
bang.

7.  Light exhibit the characteristics and
properties of a wave.

9. Apparent depth
-- is the illusion that objects under the water appear to
be nearer the surface than they really are.
--This is visible when an observer is standing beside
the swimming pool looking at an object under water.
*This phenomenon is a consequence of the bending of
light when light traverses the air-water boundary.

10. Refraction
-- is the bending of
light when it
travels from one
medium to another
of different optical
densities.

11.  Is the sluggishness of the atoms
of a medium to maintain the
absorbed energy before
reemitting.
* When light crosses the boundary
of two media of different optical
density, a change in speed takes
place. This change in speed is
manifested as bending of the light
ray.

12.  Light bends towards the normal when
traveling from a less dense medium to a
higher density medium.

13. *is a known indicator of the optical density of a
material.
* is a quantity that compares the speed of light
in that material to its speed in a vacuum.

15.  The only thing we can see is light.
 When the light bounce on object we can
understand the color & Texture
 The color an object appears depends on the
colors of light it reflects.

16. Rods and Cones in the Retina:
red
green
blue

17. Color is the perceptual quality of light.
The human eye can distinguish almost ten million
colors.
Color of Objects:
o White light is the presence of ALL the colors of the
visible spectrum.
oBlack objects absorb ALL the colors and no light is
reflected back.

18. *Emission
*Reflection
*Transmission
*Interference
*Dispersion
*Scattering

20.  is a special kind of refraction which
provided us colors of light.