Lecture 11: Radiometry & Photometry (16)
wcyjames

Does this notation S^2 denotes the surface area of the sphere?

RCD-Y

I believe so yes.

RCD-Y

Some insights into the notation used here: in Maths (oftentimes as told in math classes in Berkeley) ϕ\phi and θ\theta are swapped. This notation is used more in Physics.

YIYANGCAI

This slide shows a proof of sphere's area value is 4pir^2. By calculate the integration of a related to omega (further related with theta and phi), we end up with a value of entire sphere surface area.

sutkarsh

@RCD-Y is correct. In general, S^n represents the surface of an (n+1)-dimensional sphere (so for example, S^1 is a circle).

briana-jin-zhang

Why is dphi from 0 to pi? I have forgotten multivar calc

briana-jin-zhang

Or oops, dtheta instead of dphi

briana-jin-zhang

Ah, it's because you're supposed to visualize it kinda like a half circle on the right doing a sweep around the center (2pi for phi).

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