Light has the properties as follows:
a. Creeping downhill straight line
Light particles are very small and very fast moving with a straight line trajectory at a speed of 300,000 km / sec. The straight lines of light depicting the so-called light rays. A collection of light rays will form a light beam. Shadows occur because light propagates straight. Light can not reach the area behind the object.
b. Can penetrate translucent objects
Objects opaque or translucent objects almost entirely pass on the light it receives. Glass, glassware, bottles, jars, and water is opaque objects. Plants and animals that live in the water need sunlight. Sunlight can penetrate ocean water, river water, and the water in the pool, as long as the water was clear.
c. Can be reflected
When the light on an object, there are two events experienced by light falling on the object, namely:
1. Some of the light is transmitted into the object dikenainya
2. Most of the light is reflected back again.
d. Can be refracted
The light that travels from a substance into another substance that will be refracted at the interface. Refraction of light is called deflection of light. There are two kinds of light refraction, namely:
- Refraction of light from substance to substance tenuous meeting will be close to normal, for example, light from air to water
- Refraction of light from substance to substance tenuous meeting will be away from normal, for example, light from air to water.
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