A magnetic meridian is defined as a line on the earth’s surface approximating a great circle, which passes through the north and the south magnetic poles.
Solution
We know that tanψ=tanϕ/cosβ
where
ψ= apparent angle of dip,
ϕ = true angle of dip
β = angle formed by vertical plane with magnetic meridian
tanψ = [(tan60°)/(cos30°)]
= [√3/(√3/2)] = 2
ψ = tan–1(2)