engineering recuitment BARC Stipendiary Trainee Category I 2023 Mock Test Surveying Levelling

A light house is visible just above the horizon at a certain station at the sea level. The distance between the station and the light house is 50km. The height of light house is

1
201.36 m 
2
185.69 m
3
178.35 m 
4
168.35 m
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