Question

A 150cm tall boy stands at a distance of 8m from the lamp post and cast of shadow of 2m .Find hieght of lamp

Answer 1

Answer:

Height of the boy = 1.5m

Distance of the boy and lamp post = 8m.

Length of shadow = 2m.

tanθ = 1.5/2 = 0.75 {height of the boy is perpendicular and shadow is base}

Also tanθ = (Height of the lamp post)/(8+2) = (Height of the lamp post)/10

or, (Height of the lamp post)/10 = 0.75

or, Height of the lamp post = 7.5m [Ans]

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