Question
Calculate the solid angle subtended by the periphery of an area of 1cm² at a point situated symmetrically at a distance of 5 cm from the area.
Options :
400 × 10⁻² steradian
4 × 10⁻² steradian
14 × 10⁻² steradian
0.4 × 10⁻² steradian
Answer :
4 × 10⁻² steradian
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