Question

The true value of angle of dip at a place is 60^, the apparent dip in a plane inclined at ana angle of 30^ with magnetic meeidian is

Answer 1

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• tan-¹(2)

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α (alpha)= true angle of dip

α¹ (alpha -dash)= apparent angle of dip

B = angle made by vertical plane with magnetic meridian.

then, tanα = [(tan(α)/cosB)]

∴ tan(α¹) = [ (tan 60°/cos30°) ] = [√3 /(√3/2) ] = 2

∴. α¹ = tan-¹(2)

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