What is the approximate geographic range of...

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Question 1 of 2066636ee928f7522a1c519184

What is the approximate geographic range of Point Judith Light, Rhode Island, if your height of eye is 62 feet (18.9 meters)? Refer to "Reprints from the LIGHT LISTS AND COAST PILOTS". (use charted range of 20 miles as nominal range)

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Question 1 of 20

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🔍 Key Concepts

• Geographic range vs nominal (charted) range of a light • Use of height of eye and geographic range tables in the Light Lists/Coast Pilots • Combining observer’s distance to horizon with the light’s height to find total geographic range

💭 Think About

• First, think about what geographic range depends on: is it brightness, curvature of the earth, or both? • How would you use a table (or formula) with your height of eye and the light’s height to get a combined distance? • Once you estimate the geographic range from geometry, how do you compare it to the nominal range (20 miles) to decide which one actually limits what you can see?

✅ Before You Answer

• Be sure you’re using height of eye (62 ft) correctly to find your distance to the horizon • Verify you’ve accounted for both the observer’s and the light’s height when thinking about geographic range • Check whether the nominal range (20 miles) is greater or less than your computed geographic range; the smaller one limits what you can actually see

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