Skip to Content Skip to Header Navigation

Mission RM4 Regular vs. Diffuse Reflection

Getting your Trinity Audio player ready...

Hold down the T key for 3 seconds to activate the audio accessibility mode, at which point you can click the K key to pause and resume audio. Useful for the Check Your Understanding and See Answers.

 The Question

Diffuse reflection is different than regular (or specular) reflection. In diffuse reflection, light _____; this is not the case for regular reflection. Include all that apply.

 Physics Rules

Diffuse Reflection:
Diffuse reflection occurs when a beam of light (a collection of several individual light rays) reflects off a rough surface. Each individual light ray within the beam approaches the surface parallel to each other. Upon reflection, the individual light rays within the original beam scatter (or diffuse) in different directions.

 Don't be Fooled

Because diffuse reflection happens distinctly differently than regular or specular reflection, many students falsely believe that it demonstrates two different rules of reflection. To them, regular reflection follows the law of reflection and diffuse reflection follows some other law. But don't be fooled! In both cases, the law of reflection is followed.

 Think About It

As discussed in the Don't Be Fooled section, light follows the law of reflection in both the case of diffuse reflection and the case of regular or specular reflection. So this is not a difference between the two types of reflection.

Return to Screen Reader Navigation