CBSE Class 11-science Answered
Trignometry
Asked by | 04 Apr, 2008, 02:15: PM
Expert Answer
let height of lamp post = h
and its distance from center of the road = x
here lamp focus covers a total area within 30o so the horizontal distance which is covered by light of lamp should be 10m
so at 10m distance the angle made by lamp on the boundary point will be 90-30 = 60
so we have tan 45 = h/x
and tan 60 = h/10 => h= 10 tan60 = 103
so l=h=103
Answered by | 08 Sep, 2008, 07:10: PM
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