Question

question #19 what type of reflection occurs when light is reflected off a smooth surface?

refraction
diffuse reflection
specular reflection
interference

question #20 when an object causes a wave to change direction and bend around it, this is known as

reflection
refraction
interference
diffraction

Explanation:

• Question #19: Specular reflection occurs when light reflects off a smooth surface. Diffuse reflection is for rough surfaces, refraction is about light changing speed and direction when passing through mediums, and interference is about wave - wave interactions.
• Question #20: When an object causes a wave to change direction and bend around it, this is diffraction. Reflection is bouncing back of waves, refraction is change of direction due to medium change, and interference is wave - wave interaction.

Answer:

Question #19: C. Specular reflection
Question #20: D. Diffraction