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$β$ is given in the given figure

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Angle of depression

Horizontal level

Angle of elevation

Line of sight

answer is B.

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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.

Here, A is an object below the level of the eye and O is eye.

Also, OB is a horizontal line through O.

Thus $∠ A O B = B$ is called the angle of depression.

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