Light is made up of electromagnetic waves that can travel through vacuum at high speeds without a medium. When light hits an object, it can be absorbed, reflected, or pass through. Transparent materials allow most light to pass through, translucent materials allow some light, and opaque materials do not allow any light to pass through. Light travels in a straight line and forms shadows when it hits opaque objects, with the shadow position depending on the light source position.

1. How does light travel
and interact with
matter?
Chapter 12: Lesson 3:

2. What is light made up of?
Electric waves Magnetic waves

3. What is light made up of?
Electric waves Magnetic waves
This is why we call light waves, Electromagnetic waves.
Electromagnetic waves do not need a medium to travel.

4. What happens to light when it hits an object?
It is absorbed
It is reflected
It passes
through the
object
Objects of different color can absorb different amounts of light.
For example: BLACK absorbs the most light energy.
This is why in summer, most people try to avoid black and wear either
light or white shirts.

5. Determine what is transparent, translucent
and opaque.

6. Types of materials
Transparent
Translucent
Opaque
Allow most light to
pass through them.
Allow some light to
pass through them.
No light can pass
through them.

7. Distance traveled by light from sun to earth
=90 million miles
Light travels at very high speed.

8. Light can travel through vacuum.
Speed of light in vacuum is faster than its
speed in solid, liquid or gas.

9. Light travels in a straight line.

10. When light does not pass through opaque
objects it forms SHADOWS.

11. Position of the SHADOW depends upon the
position of the light source.
Example:

12. Draw the sunlight rays falling on the objects.

13. Determine
the position
of the sun in
the following
pictures.