The plane of dip circle is set in the geographical meridian and the apparent dip is θ. It is then set in a vertical plane perpendicular to the geographical meridian. The apparent dip becomes θ2. The angle of declination α is given by
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a
tan α=tan θ1 x tan θ2
b
tan α=tan θ12 x tan θ22
c
tan α=tan θ1tan θ2
d
tan α=tan θ2tan θ1
answer is C.
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Detailed Solution
Here, in geographical meridian, tan θ1=VH cos αIn a plane perpendicular to the magnetic meridian, tan θ2=VH cos 90o-α=VH sin α∴tan θ1tan θ2=sin αcos α =tan α
The plane of dip circle is set in the geographical meridian and the apparent dip is θ. It is then set in a vertical plane perpendicular to the geographical meridian. The apparent dip becomes θ2. The angle of declination α is given by