Discussion
Assertion (A): The 45 to 0 geometry always excludes the specular component.
Reason (R): The specular beam leaves at 45 degrees on the far side and misses the detector entirely.
Answer: B
Both are true and the reason gives the geometry, and there is no option to include it. Sphere geometries by contrast offer both possibilities in one instrument. A gloss trap provides the choice. Opening it lets the specular beam escape.
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