A mirror returns light at an angle equal to its angle of incidence through this process.

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Reflection: Bouncing of light or sound off a surface. Source: Reflection (physics) ↗

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15Waves spread around obstacles and through gaps in this process, especially when the gap is comparable to their wavelength.RECALL
Diffraction
Diffraction spreads waves around obstacles or through narrow gaps, most visibly when the gap nears the wave's own length.
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16These mechanical waves carry audible vibrations through a medium such as air or water.IDENTIFY
Sound Waves
Sound travels as vibrations through a medium and moves faster through water than through air.
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17Most materials become slightly larger when heated through this process.RECALL
Thermal Expansion
Thermal expansion makes most materials grow slightly as they heat, loosening a stuck lid under hot water.
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