Which are the angles of depression?

Angle Of Depression

In Fig.12.58, what are the angles of depression from the observing positions O_(1) and O_(2) of the object at A?( FIGURE)

From the top of a cliff 50 m high, the angles of depression of the top and bottom of a tower are observed to be 30^(@) and 45^(@). The height of tower is

A man observes that when he moves up a distance c metres on a slope, the angle of depression of a point on the horizontal plane from the base of the slope is 30^0, and when he moves up further a distance c metres, the angle of depression of that point is 45^0dot The angle of inclination of the slope with the horizontal is.

From the top of a building of heighth metresthe angle of depression of an object on theground is 'a'.The distance (in metres) of theobject from the foot of the building is -