In clear weather, you will lose sight of...

Question 1 / 2707066636eea28f7522a1c51af60

Question 1 of 2707066636eea28f7522a1c51af60

In clear weather, you will lose sight of Point Judith Light at what distance? (use charted range of 20 nm as nominal range)

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Question 1 of 27070

In clear weather, you will lose sight of Point Judith Light at what distance? (use charted range of 20 nm as nominal range)

🔍 Key Concepts

• Nominal range vs geographic range of a light (which one limits visibility in clear weather?) • Effect of earth’s curvature and height of eye on how far you can see a light • Using the lesser of charted/nominal range and geographic range to find when you lose sight

💭 Think About

• Think about what “clear weather” implies about the limiting factor: is the light’s brightness the limit, or the curvature of the earth? • Recall or look up the formula or table that gives geographic range based on the height of the light and the observer’s height of eye; which distance does that give you here? • Once you know the geographic range, compare it to the charted (nominal) range of 20 nm—what does that tell you about when you actually lose sight of the light?

✅ Before You Answer

• Be sure you are using geographic range (not luminous/nominal range) for a clear-weather visibility limit problem. • Confirm which distance is smaller: geographic range or 20 nm; that smaller value controls when you lose sight. • Verify that your computed/selected distance matches a realistic distance to the horizon for typical heights of eye and light—eliminate any option that seems too close or too far for a 20 nm nominal light.

Question 1 of 27070

In clear weather, you will lose sight of Point Judith Light at what distance? (use charted range of 20 nm as nominal range)

14.0 nm

12.6 nm

10.3 nm

9.2 nm

Question 1 / 2707066636eea28f7522a1c51af60

Question 1 of 2707066636eea28f7522a1c51af60

In clear weather, you will lose sight of Point Judith Light at what distance? (use charted range of 20 nm as nominal range)

Back

Question 1 of 27070

In clear weather, you will lose sight of Point Judith Light at what distance? (use charted range of 20 nm as nominal range)