5. Motion parallax. Another very powerful cue to depth is given by the changes i

Question

5. Motion parallax. Another very powerful cue to depth is given by the changes in visual angle as we change our viewpoint. For the same sideways shift, an object that is farther away must sweep through a smaller visual angle. Thus images of distant objects must move more slowly across the retina, just as the roadside appears to sweep past more quickly than the distant mountains as we look out the car window a. Suppose you are looking straight out the side window of your car. As you travel 100 m, over what visual angle (in degs) will an object sweep that is 500 m away? (Use the same equations with "size" = 100 and distance 500 b. 1000 m away?

Explanation / Answer

a. An object 500 m away will sweep over 11.4212 degrees of visual angle as you travel 100 m.

b. An object 1000 m away will sweep over 5.7248 degrees of visual angle as you travel 100 m.

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