RADIAN AND STERADIAN:

Radian: The radian is the measure of a plane angle. One radian is defined as a plane angle with its vertex at the centre of a circle of radius r which is subtended by an arc whose length is equal to r.

Steradian: It is the measure of a solid angle. It is defined as the solid angle with its  vertex at the centre for  a  sphere of radius r which is subtended by a spherical surface area equal to the area of a  square, whose side length is r.

SOLID ANGLE: Continue reading “”

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