Define angle of dip.

Define angle of incidence and angle of refraction.

If angle of dip shown by a dip circle at 30° with magnetic meridian is 60°, then the angle of dip shown by dip circle at 45° with magnetic meridian is

The true value of dip at a place is 30^(@) . The vertical plane carrying needle is turned through 30^(@) from magnetic meridian . Calculate apparent value of angle of dip .

Define the term angle of dip and declination.

The angle of dip at a place is delta . If the dip is measured in a plane makinng an angle theta with the magnetic merdian, the apparent angle of dip delta_(1) will be

The real angle of dip, if a magnet is suspended at an angle of 30^(@) to the magnetic meridian and the dip needle makes an angle of 45^(@) with horizontal, is: