### Diffraction 2

1. State whether each of the following are TRUE or FALSE.
1.1. Diffraction is the ability of waves to travel around corners and obstacles in their path.
1.2. Diffraction occurs only for transverse and not longitudinal waves.
1.3. The amount of diffraction increases with increasing wavelength.

2. Consider the following important terms.
2.1. What is meant by the term “monochromatic”?
2.2. What is meant by the term “wavefront”?

3. MCQ: Diffraction of light confirms that light is:
A. a transverse wave
B. a longitudinal wave
C. a wave
D. a particle

4. State whether the following are true or false.
4.1. A narrower slit produces greater diffraction.
4.2. A smaller wavelength produces a greater diffraction.
4.3. Blue light produces bands that are further apart than red light.
4.4. Green light is monochromatic.

5. In a diffraction pattern, the dark areas are regions of ……………… interference?

### More Important Points for Diffraction

1. Light of Higher Wavelength produces Greater Diffraction

2. A Narrower Slit produces Greater Diffraction.

4. Diffraction of light DOES CONFIRM that light has a WAVE NATURE.

5. Diffraction occurs for BOTH transverse and longitudinal waves.

6. Hence diffraction cannot be used to distinguish between transverse and longitudinal waves.

7. Diffraction of light DOES NOT CONFIRM whether light is transverse or longitudinal.

8. Diffraction is the ability of light to spread out in wavefronts as they pass through a small aperture or sharp object. Diffraction causes the light to ultimately travel in other directions.

9. Diffraction is explained in terms of Huygens Principle .

10. Diffraction does not affect

• frequency (or period)
• wavelength
• speed