## Detailed description

- Two straight lines, one horizontal meet at a point making an angle labelled 'angle of elevation'. The second line which is above the horizontal line, is labelled 'line of sight' and its end point is labelled 'object'. A diagram of an eye is beside the angle.
- Two straight lines, one horizontal meet at a point making an angle labelled 'angle of depression'. The second line which is below the horizontal line, is labelled 'line of sight' and its end point is labelled 'object'. A diagram of an eye is beside the angle.