Question

define solid angle .show that the solid angle subtended by a closed surface on any point inside it
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Answer 1

Answer:

The solid angle subtended by a closed surface of any shape at any point inside it, is always steradian. ... The solid angle subtended by any plane surface at any point away from it, is always less than steradian. The solid angle subtended by a point or a line at any point in the space, is always zero.

Answer 2

The solid angle subtended by a closed surface of any shape at any point inside it, is always steradian. ... The solid angle subtended by any plane surface at any point away from it, is always less than steradian. The solid angle subtended by a point or a line at any point in the space, is always zero
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