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focal height of lighthouse

focal height of lighthouse

vertical distance between the light source of a lighthouse and the sea level

en-US/ˈfoʊkəl ˈhaɪt ʌv ˈlaɪˌthaʊs/

en-GB/ˈfəʊkəl ˈhaɪt əv ˈlaɪthaʊs/

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