A worker is filling out a report at a workbench illuminated by a 200-cd source located...

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A worker is filling out a report at a workbench illuminated by a 200-cd source located 750 mm overhead. The report form is white paper (85% reflectance), and the inspector is writing with black ink (10% reflectance). Determine (a) the illumination on the form, (b) luminance of the form, and (c) contrast in the writing task. (d) Assuming that a worker is 35 years old and that speed and accuracy are important but not critical, is the illumination for this task suffi- cient? If not, what illumination level is required? A worker is filling out a report at a workbench illuminated by a 200-cd source located 750 mm overhead. The report form is white paper (85% reflectance), and the inspector is writing with black ink (10% reflectance). Determine (a) the illumination on the form, (b) luminance of the form, and (c) contrast in the writing task. (d) Assuming that a worker is 35 years old and that speed and accuracy are important but not critical, is the illumination for this task suffi- cient? If not, what illumination level is required?

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This problem involves the concepts of illumination luminance and contrast which are fundamental in lighting design and vision ergonomics Lets address ... View the full answer