| 21. | Therefore, its radiance ( power per unit solid angle per unit projected source area ) is the same.
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| 22. | By the same argument, the maximum solid angle that can be subtended at any point is 4 sr.
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| 23. | The BRDF has units sr " 1, with steradians ( sr ) being a unit of solid angle.
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| 24. | The name of this type of microscopy is derived from the maximal possible solid angle for excitation and detection.
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| 25. | The solid angle \ Omega that is used for illumination and detection is increased and approaches the ideal case.
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| 26. | The anholonomy is still proportional to the solid angle subtended by the path, which may now be quite irregular.
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| 27. | Instead of the solid angle, the momentum transfer may be used as the independent variable of differential cross sections.
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| 28. | When implementing the above equation care must be taken with the atan function to avoid negative or incorrect solid angles.
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| 29. | The units of the spectral radiance are seen to be energy / time / area / solid angle / frequency.
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| 30. | :Intensity is the energy flux emitted per unit solid angle, so this will be uc / ( 4 pi ).
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