Light travels in a straight line
Many events or phenomena show that light travels in a straight line.
Look at some of these examples.
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| The beam of light from a hole |
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| The beam of light from a touch light |
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| The beam of light from the lighthouse |
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| The search light from the helicopter |
A shadow is formed when light from a light source is blocked by an opaque or translucent object.
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| It is the shadow of a hand |
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| The figure are opaque, so the light cannot shine through them |
A shadow is formed when light from a light source is blocked by a translucent object.
Wrap it up
1 | Light travels in a straight line. |
2 | A shadow is formed when light is blocked by an opaque or translucent object. |
3 | The size of a shadow changes according to the distance between an object and its light source or the distance between the screen and the object. |
4 | The shape of a shadow changes according to the position of the light source or the position of the object. |
5 | Light can be reflected. |
6 | We can see an object because light from a light source that falls onto the object is reflected by the object into our eyes. |
7 | Many devices in our everyday life use the principle of light reflection such as dental mirror, periscops, side mirror of a car and convex mirror on a sharp bend of a road. |
glitter-graphics.com
yes~we can do a lot of things with light...but we will lost our direction without light...>.<
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