Define the following terms:
1. Heterogeneous medium
2. Eclipse
3. Fulcrum
4. Parallel beam of light
5. Ray of light
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1. An optical medium which has different composition at different points is called heterogeneous medium.
2.an occasion when the moon or the sun seems to completely or partly disappear, because one of them is passing between the other and the earth
3.A lever is a rigid rod which is free to move about a fixed point
4. Parallel beam of light: A parallel beam of light is light that is parallel to each other when coming from the source of light.
5. The light traveling in any one direction in a straight line is called a ray of light. A group of light rays given out from a source is called a beam of light.
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