By Alex Montwill, Ann Breslin
This booklet is the 1st of its type to commit itself at this point to the most important function performed by means of light and electromagnetic radiation within the universe. Readers are brought to philosophical hypotheses comparable to the economic system, symmetry, and universality of common legislation, and are then guided to functional results comparable to the principles of geometrical optics or even Einstein's famous yet mysterious courting, E = mc2. so much chapters characteristic a pen photo of the lifestyles and personality of a suitable clinical determine. those "Historical Interludes" comprise, between others, Galileo's conflicts with the Inquisition, Fourier's taunting of the guillotine, Neils Bohr and international warfare II, and the original personality of Richard Feynman.
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Additional resources for Let There Be Light: The Story of Light from Atoms to Galaxies (2nd Edition)
Than spherical. The geometrical propCurved mirrors erties of a parabola bring the reflected exactly fulfil the rays together. criteria for perfect focusing. indd 30 12/21/2012 10:34:22 AM b1364 Let There Be Light 2nd Edition Light as a Ray: Reflection reflected rays focal point 31 incoming rays optic axis concave sphere A concave mirror will reflect parallel rays through a focal point. source optic axis concave sphere The same mirror will give a beam of parallel reflected light if the source is placed at the focus.
Indd 31 12/21/2012 10:34:23 AM b1364 Let There Be Light 2nd Edition 32 Let There Be Light 2nd Edition Applications of concave mirrors Practical applications of concave mirrors are more common than one might expect. They can be divided into two classes: 1. Creation of a directed beam of light A source of light (or any source of electromagnetic rays) at the focus of a concave mirror will give rise to a parallel beam. In the case of a lighthouse the mirror revolves around the source, producing a sweeping parallel beam of light.
The result was a prediction that by accelerating an electric charge, one would create a signal which would propagate through space: An oscillating charge would give rise to an electromagnetic wave, travelling through space at a fixed speed. Maxwell was able to calculate this speed, and obtained an answer practically identical to the measured speed of light. This could hardly be a coincidence. Light must be an electromagnetic wave. Light as a particle In 1900, Max Planck (1858–1947) made a discovery which appeared to be incompatible with the wave theory of light.