1. The earliest scientific theories of the nature of light were proposed around the end of the 17th cent. In 1690, Christian Huygens proposed a theory that explained light as a wave phenomenon. However, a rival theory was offered by Sir Isaac Newton in 1704.
2.The primary properties of light are intensity, propagation direction, frequency or wavelength spectrum and polarization. Its speed in a vacuum, 299 792 458 metres a second (m/s), is one of the fundamental constants of nature.
3.The law of reflection states that when a ray of light reflects off a surface, the angle of incidence is equal to the angle of reflection.
4.Reflection is divided into three types: diffuse, specular, and glossy.
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Answer:
1. The earliest scientific theories of the nature of light were proposed around the end of the 17th cent. In 1690, Christian Huygens proposed a theory that explained light as a wave phenomenon. However, a rival theory was offered by Sir Isaac Newton in 1704.
2. The primary properties of light are intensity, propagation direction, frequency or wavelength spectrum and polarization. Its speed in a vacuum, 299 792 458 metres a second (m/s), is one of the fundamental constants of nature.
3. The law of reflection states that when a ray of light reflects off a surface, the angle of incidence is equal to the angle of reflection.
4. Reflection is divided into three types: diffuse, specular, and glossy.
Explanation:
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