| FRESNEL | Physicist who helped establish the wave theory of light and invented a lens used in lighthouses (7) |
| YOUNG | Physicist and Egyptologist who helped to establish the wave theory of light and assisted in the Rosetta Stone's decipherment (5) |
| AIRHORN | Found in lighthouses, it produces a large,deep sound to warn ships in murky weather |
| PASCAL | Scientist who contributed towards hydraulics and atmospheric pressure, developed probability theory with Fermat and invented a calculator (6) |
| SOLANDER | Linnaean disciple who travelled with James Cook and invented a book-like box for holding such items as botanical specimens, colour plates, manuscripts, maps and papers (8) |
| FRESNELS | Lenses in lighthouses and stage lights |
| HUYGENS | Physicist who formulated the wave theory of light, described the shape of Saturn's rings, discovered Titan and invented the pendulum clock (7) |
| CROOKES | Sir William -; chemist and physicist who discovered thallium and invented the spinthariscope (7) |
| BARCODE | Inspired by Morse code and invented by a former boy scout, machine-readable data in the form of parallel lines (7) |
| FISHEYE | Very wide-angle lens used in photography (7) |
| SUNLESS | Dark lens used in Texas, for example? (7) |
| TSUNAMI | Wave theory starting with a minus of sorts (7) |
| RAMSAY | Chemist who helped establish the noble gases argon, helium, krypton, neon and xenon as a new group in the periodic table |
| IRAALLEN | Member of the Green Mountain Boys who helped establish the University of Vermont |
| MONOCLE | Corrective lens, used only in one eye (7) |
| BEAUFORT | Lady Margaret -; Henry VII's mother and key figure in the Wars of the Roses who helped establish two prominent Cambridge colleges (8) |
| KELLER | Helen who helped establish the ACLU |
| ONO | Yoko who helped establish the John Lennon Scholarships |
| NEWTON | English polymath who discovered the laws of gravity and motion and invented calculus, Isaac _ (6) |
| LIEBIG | Organic chemist who discovered that nitrogen was an essential plant nutrient and invented the proces |
