Stacked optical spectra diagram showing continuous, absorption, and emission bands (laptop

Vintage-style educational diagram of visible-light spectra arranged in labeled rows A–G on a black background. Rows show (A) a full continuous rainbow...

• optical spectrum
• absorption lines
• emission lines
• continuous spectrum
• visible light
• spectroscopy diagram
• spectral lines
• rainbow gradient
• educational poster
• physics illustration
• wavelength scale
• retro scan
• horizontal spectrum strips
• rainbow gradient bands
• black background
• white/beige rectangular source block
• stair-step small white squares
• vertical tick marks/scale
• thin bright vertical emission line
• row labels: a b c d e f g
• small letter labels adjacent to tick marks

Row labels: A, B, C, D, E, F, G. Small letter labels near tick marks (appearing as: G F b E D C B a).