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element of solid angle ( free )


Caution
Fill in all cells except one.
Choose all parameters unit.
It is assumed that the dimensions of the observed surface are much smaller than d.
All parameters are positive.

ParameterValueunit
i
d
dS
dO
element of solid angle
i : angle between the perpendicular to the observed surface and the direction of observation d : distance between the observation point and the observed surface dS : area of the observed surface dO : solid angle

Note
This calculation page can not detect all unrealistic inputs.



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