Perspective (distortion effect): the smaller the focal length is, the bigger the distance between the near and distant objects will appear.

1. PERSPECTIVE
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Focal length is also related to the perspective distortion effect.
Simply, the smaller the focal length is, the bigger the distance between the near and
distant objects will appear.

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f = 15 mm, distance to the model: 2 m
For example, on this picture, we see how far the mountains are from Mary:

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f = 35 mm, distance to the model: 5 m
On the lower image, however, the mountains appear very close even though both
pictures were taken from almost the same distance from the mountains.

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The change in perspective has also affected Mary's face. In the first picture, it's elongated like a bicycle
helmet while, in the second one, the proportions are completely normal.

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