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A massive object in space causes gravita...

A massive object in space causes gravitational lensing. Light from a distant source gets deflected by a massive lensing object. This was first observed in 1919 and supported Einstein’s general theory of relativity.
The angle `theta` by which light gets deflected due to a massive body depends on the mass (M) of the body, universal gravitational constant (G), speed of light (c) and the least distance (r) between the lensing object and the apparent path of light. Derive a formula for `theta` using method of dimensions. Make suitable assumptions.

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