🤔 Who invented the system of lenses that revolutionized lighthouse optics, making lights visible from much greater distances?
Difficulty: Easy
⚙️ What does the term 'dioptric' refer to in the context of lighthouse lens systems?
Difficulty: Medium
💡 In a Fresnel lens, how is light that would otherwise be wasted (i.e., light emitted vertically or downwards) redirected to enhance the main horizontal beam?
Difficulty: Hard
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