Related Clues:

• Cut-glass object teacher put up in the course of the afternoon
• Solid figure of knight turning up to be received by premier
• The 'Dark Side of the Moon' cover has one
• Teacher turning up during autopsy's a possible shedder of light
• Refracting body
• Elevated teacher installed in fairly quiet block for light work
• It separates light into colour spectrum
• Optical device used to deviate a beam
• Figure purse contains shilling
• Solid that, when divided into three parts, describes this puzzle's theme
• Object depicted on the cover of Pink Floyd's 'The Dark Side of the Moon'
• Female character in The Importance of Being Ernest — optical device
• Light-bending glass
• Light-refracting device
• Po-faced about school figure mixing up colours