Rectangular Refraction Acrylic Block, 100 x 75 x 18mm Subcategory_Microscope Slides this metal-cased spectroscope pairs a

this metal-cased spectroscope pairs a 600 lines/mm holographic replica grating with sample vials and mount

each 20mm on edge with a top hook for suspending in water during Archimedes-principle and buoyancy experiments

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

with the (Cu) element stamp and a total 1

87-inch focal length

Rectangular Refraction Acrylic Block, 100 x 75 x 18mm Subcategory_Microscope Slides this metal-cased spectroscope pairs aPairs 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.