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### Course: Middle school physics>Unit 4

Lesson 4: Absorption and reflection

# Absorption and reflection

Light interacts with different media in various ways, including refraction, reflection, and absorption. Refraction changes light's direction when it moves between mediums. Reflection occurs when light bounces off a surface, like a lake reflecting mountains. Absorption happens when a material, such as trees or rocks, soaks up light and doesn't reflect or transmit it. Created by Sal Khan.

## Want to join the conversation?

• what happen when the light is refracted when go through the water? can it reflected again?
• When light is refracted it just changes direction a little bit. After that, it can still be reflected. Light only stops when it is absorbed.
• how many times can light be reflected?
• Light can be reflected any number of times if the material it's reflecting off of doesn't absorb any of the light. If the material does absorb some light, eventually there will basically be no light left to keep reflecting. Does that help?
• wHaT hAPPens WHen YoU pUT 2 mIrrrORS IN faCE WIth EACHOtHeR??
(1 vote)
• You get infinity 🔲∞🔲
• what if there is no light for months what would happen
• a little something called death
• if your body absorbed all of the light would you be invisible
• No, you would be as black as a black hole.
• iN THE VIDEO, tHeRe Is PICTURE oF MOUnTAiNS rIghT? WhAt If ThE uPSIde doWN (oR REfLeCtIOn) Is a gaTeway To a diMEnsioN?
• It is just not a different dimension
(1 vote)
• Differently-colored objects just reflect different frequencies of visible light back into our eyes. For example, an orange gets hit with white light (light containing every frequency of light). It reflects the frequency that corresponds to the color orange, and absorbs the rest. So our eyes only see the frequency of visible light we call "orange." But if we could see other frequencies of light (ultraviolet, infrared, etc), would the same thing happen with them? Which property of an object decides which light frequencies bounces off and which don't, anyway?
• All frequencies of light can be reflected. The colours of the object that we see are reflected by specific things called "pigments." There are some flowers which look single-coloured to human eyes. Still, to animals or an ultraviolet camera, there are specific parts of the petals that point to bees where the nectar and pollen are located. I hope this helps.
(1 vote)
• What would happen if all light was reflected?