A line passing through places having zero value of magnetic dip is called

The perpendicular drawn to magnetic axis and passing through centre of magnetic dipole is called as

Lines joining the places of zero Dip' is called

Light whose vibrations take place in only one of the infinite number of planes passing through the line of propagation is called

Fill in the blanks. A vertical plane containing the longitude circle (at the plane) and axis of rotation of the earth is called______ . Similarly a vertical plane passing through a place and containing the axial line connecting the magnetic north-south poles of earth is called______ .

In a magnetic map, the line joining the places of zero dip is called an aclinic line. This line can also be called