The interactions occur when waves pass from one medium to another. The types of interactions are reflection, refraction, and diffraction. An echo is an example of wave reflection. Refraction is when waves bend as they enter a new medium at an angle

1. SPS9c.
Investigate the
phenomena
of reflection,
refraction,
interference,
and
diffraction.
EQ: What occurs during the
reflection, refraction, interference
and diffraction of waves?

2. Reflection Refraction Diffraction

3. Constructive
Interference
Destructive
Interference

4. Reflection
A wave returns
as it bounces
off an object or
a medium
boundary it
cannot pass
through

5. Law of Reflection
Angle of Incidence = Angle of Reflection

6. Types of Reflection
Regular Reflection Diffuse Reflection

7. • A wave moves
from one medium
to another
medium at an
angle and its
speed changes.
• The wave bends,
changes its
direction.
Refraction

8. Refraction
New medium more dense, wave bends
towards the normal

9. • A wave passes
through an
opening or moves
past a barrier
• The wave spreads
out beyond the
opening or barrier
Diffraction

10. Diffraction
• Smaller opening,
the greater the
diffraction
• Around an
obstacle, the
bigger the
wavelength, the
greater the
diffraction

11. Interference
• Occurs when two or
more waves arrive
at the same point at
the same time
• They combine
momentarily to
make a different
wave

12. Interference

13. Types of Interference
Constructive Interference Destructive interference

14. Identify
the
Wave
Interaction!
a
b
c d

15. More information on light! (EXTRA)

16. EQ: What occurs
during the reflection,
refraction,
interference and
diffraction of waves?