USCG Exam PracticeLight List, ranges, and light characteristics
Which light characteristic has equal durations of light and darkness?
- A. Occulting (Oc)
- B. Flashing (Fl)
- ✓ Isophase (Iso)Correct
- D. Fixed and Flashing (FFl)
Why C is correct
Isophase (Iso) is defined as a light with equal periods of light and darkness. Occulting has longer light than dark, and Flashing has longer dark than light. (Light List — Iso)