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1. Particle Model: Invented by Sir Isaac newton. He devised a simple particle model to explain the properties of light. He preferred to consider light as a stream of small particles or corpuscles. These particles were emitted in all directions by a light source, travelled in straight lines and carried energy. For example, in this model, the reflection of light was considered as being similar to a tennis ball rebounding from a wall with equal angles of incidence and reflection.

2. Wave Model: In 1690, the Dutch physicist Christiaan Huygens published his Treatise on Light which developed the idea that light, like sound, travelled as a wave through a medium called the ether.

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