Answer:
D) Schwarzschild radius
Explanation:
The part of the black hole from which light cannot escape is called the event horizon
The event horizon of a black hole is determined by the Schwarzschild radius. It is given by
[tex]r_s=\frac{2GM}{c^2}[/tex]
Where
G = Gravitational constant = 6.674×10⁻¹¹ m³/kg⋅s²
M = Mass of the object
c = Speed of light = 3×10⁸ m/s
The singularity is a point where the gravitational field becomes infinite. Center of the black hole is a point of singularity.
An Einstein ring's radius is called Einstein radius.
