Choose the correct option:

True dip is not mathematically related to apparent dip.
True dip is less than apparent dip.
True dip is always greater than the apparent dip.
True dip is always equal to apparent dip.

Correct answer: True dip is less than apparent dip.

Solution

Apparent dip is measured in a vertical plane not containing the magnetic meridian: tan(delta') = tan(delta)/cos(theta) >= tan(delta). Hence the true dip is always less than (or equal to) the apparent dip.

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