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Unit 2 Particles and Waves
Unit 2 Particles and Waves

Ch-27
Ch-27

... person stands with both feet on the same step, what is the gravitational potential energy of this person, relative to the ground, on (a) the first step, (b) the second step, (c) the third step, (d) the nth step? (e) What is the change in energy as the person descends from step 6 to step 2? ...
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Light rays, gravitational waves and pulse
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History of optics

Optics began with the development of lenses by the ancient Egyptians and Mesopotamians, followed by theories on light and vision developed by ancient Greek philosophers, and the development of geometrical optics in the Greco-Roman world. The word optics is derived from the Greek term τα ὀπτικά which refers to matters of vision. Optics was significantly reformed by the developments in the medieval Islamic world, such as the beginnings of physical and physiological optics, and then significantly advanced in early modern Europe, where diffractive optics began. These earlier studies on optics are now known as ""classical optics"". The term ""modern optics"" refers to areas of optical research that largely developed in the 20th century, such as wave optics and quantum optics.
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