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Which property of light makes a pencil cast a shadow when it is held in front of a light source?
Light travels in a straight line, this is the property of light that makes a pencil cast a shadow when it is held in front of a light source.
Explanation
General characteristic of light are as follow:
1. Light is a form of energy produced by luminous objects.
2. Light travels in a straight line.
3. Light can travel through a vacuum.
4. Light can be reflected.
5. Light can be bent/refracted.
6. Light travels with a speed of 3.0 $\times$ 108 m/s in a vacuum.
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