Question

what is steradian??????​

Answer 1

Answer:

A steradian can be defined as the solid angle subtended at the center of a unit sphere by a unit area on its surface. For a general sphere of radius r, any portion of its surface with area A = r2 subtends one steradian at its center.

Answer 2

One steradian is the solid angle which with its vertex at the centre of a sphere,cuts of an area on the surface of the spear equal to that of a square having sides of length equal to the radius of the sphere. It is the S.I unit of solid angle.If S is the area cut off on the surface of a sphere of radius r, the solid angle at the centre of the sphere is given by...

solid angle = S/r^