Related Clues:
- Refraction device
- Triangular glass shape, breaks up light
- Agate's relative
- Spectrum-showing object
- Tom's the first person we hear in the middle of road (3'1,3)
- Glass triangle that separates light into the colour spectrum
- Cut-glass form
- It separates a beam of white light into colours
- A dispersive one is commonly triangular
- Light-bending crystal
- Optical device used to invert an image
- Optical separator
- Light-splitting device
- Precious stone found in the middle of the road
- Governess is sort of solid