How to Derive Gravitational Bending of Light without General Relativity | 怎样不用广义相对论推导引力产生光线弯曲

Описание: The formula and the value for the bending angle of light ways by the sun were independently derived based on the effective mass obtained from Special Relativity and Newton's Universal Gravitational Law. It is of special interest that one can derive the formula without using Einstein's General Relativity.
Before searching for the related references, it would appear that this is an important argument against the idea that physical interaction can be described in terms of geometry, as both Plato and Aristotle believed over two thousands years ago.

Nevertheless, it is revealed that the story isn't that simple. In fact, the same formulae had been derived using different methods by serveral people, including Einstein:
1. Soldner (1804)
2. Cavendish (1819, unpublished)
3. #Einstein (1911)

In 1915, after worked out his General Relativity, Einstein published a modifed formula which gives the bending angle twice as large as that derived before and then verified by Eddington in 1919.

Still, it seems worthwhile to publish this video as an example one can always revisit some basic issues in Physics to experince the thrill in predicting a complicated natural phenomenon.

#gravity #gravitationallensing #generalrelativity #photon #massenergyformula #sun #gravitationallens #eddington1919
#lightbending #timedilation #gravity #photon #Eddingtonobservation1919