What is solid angle?
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one steradian is the solid angle which with its vertex at the centre of a sphere, cuts off an area on the surface of the sphere equal to that of a square having sides of length equal to the radius of the sphere. steradian is the si unit of solid angle.
for ex:_
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^2
solid angle is a supplementary unit
for ex:_
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^2
solid angle is a supplementary unit
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