A drop of water, possibly, 5 letters
Binoculars component, 5 letters
Item on the cover of Pink Floyd's Dark Side of the Moon, 5 letters
Light beam splitter, 5 letters
Light-bending device, 5 letters
Light-reflecting body, 5 letters
Light-refracting crystal, 5 letters
Light-refracting object, 5 letters
Optical body used to disperse light, 5 letters
Optics device used by Newton, 5 letters
Parallelepiped, e.g., 5 letters
Piece of cut crystal, perhaps, 5 letters
Spectrometer component, 5 letters
Spectrum-forming crystal, 5 letters
Spectrum-forming solid, 5 letters
Spectrum-showing device, 5 letters
Telescope component, 5 letters
Thing on the cover of Dark Side of the Moon, 5 letters
Transparent pentahedron, 5 letters
Used to deviate a beam or invert an image, 5 letters
Optical device having a triangular shape and made of glass or quartz, 5 letters
Solid with trapezoidal sides, 8 letters
Chandelier danglers, 6 letters
Chandelier pendants, 6 letters
Drops of water, e.g., 6 letters
Light-refracting devices, 6 letters
Parts of binoculars, 6 letters