Q1. 🤔 Who invented the system of lenses that revolutionized lighthouse optics, making lights visible from much greater distances?
- John Smeaton
- Winslow Lewis
- Augustin Fresnel
- Alan Stevenson
Answer: Augustin Fresnel
Q2. ⚙️ What does the term 'dioptric' refer to in the context of lighthouse lens systems?
- Bending light using mirrors
- Bending light using metal
- Bending light using reflection
- Bending light using refraction
Answer: Bending light using refraction
Q3. 💡 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?
- The light is absorbed by a dark coating on the lens edges.
- The light is diffused to create a halo effect around the main beam.
- The light is directed back to the illuminant for re-emission.
- The light is gathered by lenses and mirrors (prisms) and redirected.
Answer: The light is gathered by lenses and mirrors (prisms) and redirected.

The Fresnel Lens

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