Light. These are all LUMINOUS.LUMINOUS What are some sources of light?
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Transcript of Light. These are all LUMINOUS.LUMINOUS What are some sources of light?
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Light
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These are all LUMINOUS.
What are some sources of light?
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What do luminous objects do?
LUMINOUS objects give off light.
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Is this a luminous object?
No, neither the Moon nor a mirror is a source of light. They reflect light from other sources.
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How does light travel?
Light travels straight and fast.
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How fast does light travel?
Light travels at
300,000 kilometers per second.
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How can we control light?
We can block it when it hits something OPAQUE. This makes a SHADOW.
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What does OPAQUE mean?
Opaque means you can’t see through it.
shadow
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How can we control light?
We can REFLECT it with a mirror.
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What does REFLECT mean?
REFLECT means light bounces off it.
mirror
laser
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How can we control light?
We can bend it when it pass through something TRANSPARENT .
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What does TRANSPARENT mean?
Transparent means you can see through it.
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How can we control light?
We can scatter it when it pass through something TRANSLUCENT .
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What does TRANSLUCENT mean?
TRANSLUCENT means you can almost see through it.
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How do we see things?
When light reflects off an object hits our eyes.
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LAW OF REFLECTION
plane mirror
normal line
angle of incident
incident ray
angle of reflection
luminous object
refle
cted
ray
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What happens when light hits smooth surface?
It follows the law of reflection.
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What happens when light hits a rough surface?
It still follows the Law of Reflection but it scatters.
This is DIFFUSE reflection.
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What happens when light hits a transparent surface?
It bends. This is called REFRACTION.
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What happens a light ray hits this glass block?
The glass block is more dense than the air, so the light ray bends toward the normal line.
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What happens a light ray leaves this glass block?
The air is less dense than the glass block, so the light ray bends away from the normal line.
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Can you label the picture?
A
B B
C
D
A: Light ray
B: Normal Line
C: Angle of Incident
D: Angle of Refraction
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What is a lens?
A lens is a transparent, curved object that refracts light.
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What kinds of things have lenses?
Many objects in your daily life use or have lenses.
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What are the two kinds of lenses?
They are convex lenses and concave lenses.
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What happens when light hits a convex lens?
A convex lens causes light rays to focus (bend toward the normal line) .
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What happens when light hits a concave lens?
A concave lens causes light rays to spread out (bend away from the normal line) .
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THE END