Describing properties, types of light and it's interaction with matter.

2.  Light is a form of energy that travels as
waves.
 Their wavelength determines many of the
light's properties.
 For instance, wavelength accounts for light's
color and how it will interact with matter.
 The range of wavelengths, from super short
to very long, is known as the light spectrum.

4.  Reflection
 Refraction
 Scattering
 Dispersion
 Interference
 Diffraction
 Total internal reflection
 Polarization

5. ● Reflection:
The bouncing back of a light
ray after hitting any surface is
called reflection.

6. ● Refraction:
The bending of a light wave when it
enters in a medium where it has
different speed is called refraction.

7. ● Scattering:
The phenomenon by which a beam of
light is redirected in many different
directions when it strikes on a particle
of matter, is called scattering.

8. ● Dispersion:
The process of splitting white light
into seven colors, is called
dispersion.

9. ● Interference:
The phenomenon in which the two waves
super pose to form a resultant wave of
greater, lower or same amplitude, is called
interference.

10. ● Diffraction:
The process of spreading of a light beam
by passing through a narrow aperture or
across an edge, is called diffraction.

11. ● Total internal
reflection:
Complete reflection of a light ray
within a medium (such as water or
glass) by striking the surrounding
surfaces back to the medium, is
called total internal reflection.

12. ● Polarization:
The process of transforming
unpolarized light into polarized
light, is known as Polarization.

14.  Matter is the stuff that makes up the universe —
everything that has mass and occupies space is
matter.
 For instance, a car would be said to be made of
matter, as it has mass and volume (occupies space).
 There are three types of materials:
 Transparent materials
 Translucent materials
 Opaque materials

15. ● Transparent materials:
The materials that allow complete light to pass
from them, e. g., glass, water, air.
● Translucent materials:
The materials that allow some light to pass from
them, e. g., frosted glass, wax paper.
● Opaque materials:
The materials that allow no light to pass from
them, e. g., wood, plastic, stone.

16.  Matter interacts with light in 3 ways:
 Refraction
 Happens in Transparent & Transluent
materials.
 Reflection
 Happens in Opaque materials.
 Absorption
 Happens in Opaque materials.

17.  Matter that transmits light is transparent.
 Matter that transmits light but scatters it in all
directions is translucent.

18.  Matter can reflect light. Reflection is the
bouncing of light off a surface.
 When light strikes a smooth surface, the light
bounces off at an angle equal to the angle at
which it hits the surface, producing a clear
image.

19. ● Absorption is the transfer of light energy to
matter.
● Opaque materials do not let any light pass
through them because they reflect light, absorb
light, or both. e. g., vantablack (the darkest
material).

20.  When white light strikes an object, the color of
the object depends on whether the object
transmits, reflects, or absorbs the light.
 An object that reflects a certain color of light
appears to be that color.
● For instance, a frog
appears green because
its skin absorbs all colors
but green.

21. ● An object that reflects every color appears white.
● An object that absorbs every color appears black.
● Sometimes the color of an object depends on what light
shines on it.
• If a red filter is placed between a green frog and white
light, the filter will absorb all colors of light except red,
orange, and yellow.
• The frog reflects no
light, and you perceive
the frog’s color as gray
or black.

22.  https://www.google.com/search?q=what+is+light&oq=what+is+l
ig&aqs=chrome.1.69i57j35i39j0i273j0i20i263j0.5837j0j7&client
=ms-android-huawei-rev1&sourceid=chrome-mobile&ie=UTF-8
 https://www.tulane.edu/~sanelson/eens211/proplight.htm#:~:t
ext=Light%20is%20electromagnetic%20radiation%20that,380%20n
m%20and%20730%20nm
 https://www.khanacademy.org/science/ap-biology/chemistry-
of-life/elements-of-life/a/matter-elements-atoms-
article#:~:text=The%20term%20matter%20refers%20to,substance
s%20through%20ordinary%20chemical%20reactions

23. :)