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Also, my question is:

"Calculate the Solid Angle of a cone of half-angle 'alpha'".

What is the half-angle in a cone?

- Thread starter Hoofbeat
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- #1

- 48

- 0

Also, my question is:

"Calculate the Solid Angle of a cone of half-angle 'alpha'".

What is the half-angle in a cone?

- #2

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Daniel.

- #3

Claude Bile

Science Advisor

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Solid Angles are the 3D equivalent and have (dimensionless) units of steraidians. The Solid Angle is the area projected by the solid angle on a sphere of radius r, divided by r squared.

[tex] SA=A/r^2 [/tex]

The Solid Angle of an isotropic source, for example would therefore be

[tex] 4\pi r^2/r^2 = 4\pi [/tex]

and a hemisphere would be

[tex] 2\pi [/tex]

and so on...

Claude.

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