Materials can be Transparent A material that transmits allows through light unaffected Translucent A material that transmits light but scatters it into different directions Opaque ID: 683655
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Slide1
18.3 Behavior of Light
Light and Materials – How light behaves when it hits a surface depends on the material it is made of
Materials can be
Transparent
- A material that transmits (allows through) light unaffected
Translucent
- A material that transmits light but scatters it into different directions
Opaque
– A material that does not transmit any light. Light is either absorbed, reflected, or both.Slide2
The jelly fish is Transulcent
Slide3
These bananas are opaque
Slide4
This cell phone is
transparentSlide5
18.3 Behavior of Light
Interactions of Light – When light strikes a new medium there are three possible outcomes
I Reflection
II Absorption
III TransmissionSlide6
Reflection - Light bouncing off an object
to form an image.
We depend on reflection to see.
Regular reflection – light bounces off an object in the same direction to from a reflected image Diffuse reflection – light bounces off an object in different directions no reflected image formedSlide7
Regular and Diffuse ReflectionSlide8
Images are formed by Regular reflectionSlide9
NOTE: Absorption
of light produces the colors we see. Only the color reflected reaches our eyesSlide10
When light is
transmitted
there are three possible outcomes
I Refraction –
Bending of light as it enters
a new medium (Chapter 17) II Polarization – Occurs when light waves vibrate in only one plane. III Scattering – Light waves are bent as it diffracts around tiny particles in the atmosphere Slide11
I.
Refraction
of light causes this affectSlide12
Remember the light changes speed as it enters the new medium causing it to change directionSlide13
A mirage is caused by diffraction of light through different layers of heated air
http
://
www.youtube.com/watch?v=_M0FcpQWh5ESlide14
II. Most light is
unpolarized
and vibrates in all directions a polarizing filter will allow only light vibrating in a single plane to pass.Slide15
Reflected light (glare) is often polarized and is blocked by polarized glassesSlide16
The sky looks blue because of scattering and sunsets Look red.Slide17
This sunset is caused by scattering. Only the longer wave lengths get through.