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Neglecting the effect of refraction, find in kilometres the distance of the sea-horizon from the top

Neglecting the effect of refraction, find
in kilometres the distance of the sea-horizon from the top of a cliff 200 m
above sea-level.

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The top of a mountain 1000 m in height can
just be seen from a ship approaching the land on which the mountain is
situated. If the observer’s eye is 30 m above sea-level, how far is the ship
from the mountain?

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