What is the SI unit for solid angle?
Steradian
The correct answer is Steradian.
The solid angle is a measure of the amount of the field of view from a point that a given object subtends. It's the three-dimensional equivalent of the angle in two dimensions. The SI unit for solid angle is the steradian (sr). A steradian is defined as the solid angle subtended at the center of a sphere by an area on the surface of the sphere that is equal to the square of the radius of the sphere. In simpler terms, imagine a sphere; if you take a piece of its surface area that's equal to the square of the sphere's radius, the solid angle this piece subtends at the center is one steradian.
Let's examine why the other options are incorrect:
- Radian: This is the SI unit of a plane angle (two-dimensional).
- Metre: This is the SI unit of length.
- Candela: This is the SI unit of luminous intensity.
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