🔍 Key Concepts

• Occulting light: periods of light are longer than the periods of darkness (eclipses). • In most exam diagrams, white sections = light showing, black gaps or cuts = light eclipsed (off). • Compare with flashing or isophase lights, where the light is shorter than, or equal to, the darkness.

💭 Think About

• Identify in each option whether the light is on more than it is off over one full cycle. • Look carefully at which diagram shows mostly continuous light with brief interruptions, rather than brief flashes of light. • Ask yourself: in which pattern would a mariner mostly see steady light with quick "blinks out" instead of quick "flashes on"?

✅ Before You Answer

• Make sure the correct option shows light duration > darkness duration over a full cycle. • Confirm that the pattern looks like short black interruptions in a long white (lighted) period, not the reverse. • Verify you are not confusing an occulting pattern with a flashing (short light, long dark) or isophase (equal light and dark) pattern.