# Physical Geography

1-if a person's line of vision is at the top of Building 121 feet high, how far out to sea could a person see with a good telescope?
2- the light in a lighthouse is 144 feet above sea level. How far does the light extend before it dips below sea level?
3- if an observer is on a tower 144 meters high, how many kilometers out to sea, could a surfer be observed, using a powerful telescope?

There is more of Those kind questions.. Can anyone pleas give me a website that just i put the number and find out the solution.. Or give me the formal by answering these questions?

The formula in feet and miles is the square root of 1.5 x 121 feet. So -- your first answer is 13.47 miles. Check this site for more information and the formula for figuring the distance in meters and kilometers.

http://en.wikipedia.org/wiki/Horizon

from where did u get, and how 1.5

I found the formula in the web site I posted.

1. 👍 0
2. 👎 0
3. 👁 139

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