1. Diffraction & Interference
Unit 5
Chapter 22 … Section 3

2. Diffraction & Interference
Warm-Up
Diffraction & Interference
What type of radiation is found in this part of the spectrum?
 Why are these waves bending at different angles?

3. Learning Objective: Diffraction and Interference occur.
Diffraction & Interference
Learning Objective:
Today I will be able to
describe how
Diffraction and Interference
occur.

4. Diffraction & Interference
the bending of waves around barriers or through openings
greatest diffraction occurs when the barrier/opening is the same size or smaller than the wavelength
video:

5. Diffraction & Interference
Same wavelengths, differently sized holes

6. Diffraction & Interference
Nature Examples:
Diffraction & Interference

7. Diffraction & Interference
wave interaction that happens when 2 or more waves overlap
can combine via constructive or destructive interference
We do not see interference of white light (constructive or destructive)

8. Diffraction & Interference
constructive interference: resulting wave has a greater amplitude (height) than the individual waves
destructive interference: the resulting wave has a smaller amplitude

9. Diffraction & Interference
“in-Phase”
“out-of-Phase”
video:

10. Interference: Diffraction & Interference
What the oppo-site wall looks like
p. 650

11. Examples of both combined:
Diffraction & Interference
Examples of both combined:
video:
Break-walls like those found
in Ocean-View

12. Diffraction & Interference
Sect. 3 Exit Ticket
Diffraction & Interference
Interior
Interference
Refraction
_____(1)____ is the transfer of light energy to particles of matter. _____(2)____ is an interaction of light with matter that causes light to change direction.
_____(3)___ of light waves can create optical illusions, and can separate white light into separate colors.
How much light waves diffract depends on the light’s _____(4)____. Light waves tend to diffract ____(5)____ when traveling through a narrow opening.
_____(6)______ can be constructive or destructive, and can cause bright and dark bands.