Question

Which one of the following is the unit of Radiance? (a.) W/m2 (b.) W/m2/sr (c.) W/cm/sr-1 (d.) W/sr

Answer 1

Option B w/m2/sr....

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Answer 2

Unit of radiance is (b.) W/m2/sr

• Radiance is the term used in radiometry.
• Radiance is defined as "the radiant flux emitted, reflected, transmitted or received by a given surface, per unit solid angle per unit projected area."
• Formula of radiance is - R = P/(A*solid angle).
• In the formula, R represents radiance, P represents power and A represents surface angle.
• Sr refers to steradian which is SI unit for measuring solid angle.