If light passes near a massive object, the gravitational interaction causes a bending of the ray. This can be thought of as happening due to a change in the effective refractive index of the medium given by  , n(r) = 1 + 2GM / r^2 ; where r is the distance of the point of consideration from the centre of the mass of the massive body, G is the gravitational constant, spherical object find the deviation of the ray from the original path as it grazes the object.

Q: If light passes near a massive object, the gravitational interaction causes a bending of the ray. This can be thought of as happening due to a change in the effective refractive index of the medium given by  , n(r) = 1 + 2GM / r2 ; where r is the distance of the point of consideration from the centre of the mass of the massive body, G is the gravitational constant, spherical object find the deviation of the ray from the original path as it grazes the object.