Radian and Steradian • Radian to Degrees • Lecture 04 • Physics Class 11

#radian #steradian #degrees #angle

Hello students, in this video we have discussed something very important. We have started from a very simple question that is what is radian, then we have answered it by telling that radian is the SI unit of plane angle. Then how many radians are there in one complete circle have been explained with detailed explanation. Similarly, what is a steradian, it is a solid angle subtended at the centre of a sphere by an area of its surface equal to the square of the radius of the sphere. Then we have explained that how many steradians are there in one sphere or any closed surface, its answer is 4pi steradian. That's it.

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M Aftab