Light is made up of electric and magnetic waves that travel in a straight line at very high speeds, such as 90 million miles from the sun to earth. Light can pass through transparent materials like glass that allow most light through, is partially blocked by translucent materials like wax paper, and is completely blocked by opaque materials like metal that form shadows. The position of shadows depends on the position of the light source.

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. Determine what is transparent, translucent
and opaque.

4. 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.

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

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

7. Light travels in a straight line.

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

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

10. Draw the sunlight rays falling on the objects.

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