In deriving the expression for the deflection Φ of light around a massive body, invoking Huygens' principle, Einstein arrived at the equation:(adsbygoogle = window.adsbygoogle || []).push({});

dΦ/dx^{2}= dγ/dx^{1}

where γ is the speed of light in units of c, and the x^{μ}are space coordinates.

How is this equation arrived at?

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# I The deflection Φ of light around a massive body...

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