The angle of depression of a viewed object is the angle formed by the line of sight with the horizontal when it is lower than the horizontal level is

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This is the case when we raise our heads to look at the object.

meaningless definition

When we lower our heads to look at an object.

is the case when we look directly at the object.

answer is A.

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Detailed Solution

The angle of depression is defined as the angle formed by the horizontal line of sight and the downward line of sight to an object.

You could measure the angle of depression, for example, if you were standing on top of a hill or a building and looking down at an object.

The angle of depression of a viewed object is the angle formed by the line of sight with the horizontal when it is lower than the horizontal level is when we lower our heads to look at an object.

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