The Light List indicates that a light has a...

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Question 1 of 2066636ee928f7522a1c519a90

The Light List indicates that a light has a nominal range of 14 miles and is 42 feet (12.7 m) high. If the visibility is 16 miles and your height of eye is 20 feet (6.1 m), at which approximate distance will you sight the light?

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🔍 Key Concepts

• Nominal range vs. geographic range of a light • Effect of meteorological visibility on nominal range from the Light List • How height of light and height of eye combine to give geographic range (use table or distance-by-height formula)

💭 Think About

• First, decide whether the limiting factor is the light’s brightness (nominal range) or the curvature of the Earth (geographic range). Which one gives the shorter distance? • Use the heights given (light 42 ft, eye 20 ft) to find the geographic range. Compare that with the nominal range adjusted for 16-mile visibility. • Look at the choices and ask: which value reasonably matches the smaller of the two ranges you computed (brightness-limited vs. earth-curvature-limited)?

✅ Before You Answer

• Confirm that nominal range 14 miles is based on 10-mile visibility, and adjust it for 16-mile visibility using a luminous range diagram or conceptually in that direction. • Compute geographic range from both heights (light + eye) using the standard distance-by-height method or table; do not forget to include both heights. • Before picking an answer, verify you are using the more restrictive of the two ranges (you cannot see the light farther than either its luminous or geographic limit).

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