A temple marked 5 1/2 inches corresponds closest to which of the following lengths?

To determine which option corresponds closest to 5 1/2 inches, it is essential to convert inches into millimeters. The conversion factor to remember is that 1 inch is equal to 25.4 millimeters.

First, convert 5 1/2 inches to decimal form, which is 5.5 inches. Then, multiply by the conversion factor:

5.5 inches × 25.4 mm/inch = 139.7 mm.

When rounded, this value is approximately 140 mm. Thus, when comparing the available options, 140 mm is the closest match to the converted measurement. This highlights the importance of accurate unit conversion in optical dispensing, as it ensures that measurements align with international standards and practices in the field.