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Consider a 12 inch ruler held vertically, positioned 6 inches from your eye. Now imagine two beams of light coming from the top and the bottom of the ruler, converging at your eye at an angle of 90 degrees. Your perception of the size of the ruler is determined by the angle between these two beams of light. Now image the ruler is moved back so it is 1 foot (twice as far) from your eye. The two beams of light from the top and bottom of the ruler now converge at an angle that is twice as small, 45 degrees. Therefore, the apparent size of an object is indirectly proportionate to the distance from the observer.
Wiki User
∙ 15y ago
Wiki User
∙ 8y agoThings that are farther away look smaller because they shrink when you are not looking (just kidding). Things look smaller because of mathematics: the visual system is similar to a lens in a camera and the subtending angle is what gets smaller.
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