Which angle of an object viewed is the angle formed by the line of sight with the horizontal when it is below the horizontal level i.e: the case when we raise our head to look at the object.

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Angle of elevation

angle of depression

ground

none

answer is A.

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Detailed Solution

We need to find the angle of an object viewed is the angle formed by the line of sight with the horizontal when it is below the horizontal level i.e: the case when we raise our head to look at the object.
When an observer views an object not placed at the eye level of the observer, the line of sight creates an angle with the horizontal line. The line of sight can create two types of angles with the horizontal line based on the position of the object. If the object is placed below the horizontal line, then the angle made between the line of sight and horizonal line is the angle of depression and if the object is placed above the horizontal line, then the angle made between the line of sight and horizonal line is the angle of elevation.
Thus, the angle of elevation of an object viewed, is the angle formed by the line of sight with the horizontal when the object is above the horizontal level.
Therefore, option 1 is correct.

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