“light is a wave,” “light is a particle”24 October 2011 PHYS222 - Lecture 26 - Prof. Ruslan Prozorov - Iowa State University 2 346.63... 10J s=2hcUpchfhfhpkchhIt turns our EM waves can interact with matter in portions called PHOTONS. for every wavelength, there are photons with energy Uand momentum p
introduction to geometric optics Select an object of your choice (table, book, coin, neighbor’s head). Think about: •what it means to “see it” •how you perceive the position of that object EM waves (light) from lamps hit surface and are reflected. Waves propagate spherically in all directions from object. Your eye is sensitive to light brain “traces back” to where the light comes from. 3D perception comes from brain comparing images from each eye. 24 October 2011 PHYS222 - Lecture 26 - Prof. Ruslan Prozorov - Iowa State University 3
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wave fronts and rays oLight is actually a nearly uncountable number of electromagnetic wave fronts, but analysis of refraction or reflection are made possible by treating light as a ray. 24 October 2011 PHYS222 - Lecture 26 - Prof. Ruslan Prozorov - Iowa State University 4