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An apparent dip is always

  • A.measured perpendicular to the strike
  • B.less than the true dip
  • C.greater than the true dip
  • D.equal to the true dip

Answer: B

Correct answer: less than the true dip

True dip is the steepest possible line in the plane, so any section not perpendicular to the strike cuts the bed obliquely and shows a gentler angle: \[ \tan\delta_{app} = \tan\delta \cos\theta, \] where \( \theta \) is the angle from the true dip direction. The apparent dip falls to zero along the strike itself.

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