Rectangular Refraction Acrylic Block, 100 x 75 x 18mm Subcategory_Microscope Slides with the (Cu) element stamp

with the (Cu) element stamp and a total 1

measuring period under different loads to isolate mass from weight

this fan-shaped nylon brush rides a twisted stainless steel handle flexible enough to bend around difficult interior angles

this 80mm steel needle in a 6mm rod doubles as a precise alignment reference for image-formation and ray-tracing setups

87-inch focal length

Rectangular Refraction Acrylic Block, 100 x 75 x 18mm Subcategory_Microscope Slides with the (Cu) element stampPairs 100 by 75mm with 18mm thickness on an acrylic rectangular refraction block, the wider working face giving longer beam paths for clear refraction angle measurements.