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SIZE vs. APPARENT SIZE
diameter of a fifty-cent piece (1 1/2 inches
taken with the ruler was the object's real
the size of a distant object is measured, astro-
Hold a coin
(or your thumb) in front of you, close one eye,
An analogy can be made to the apparent sizes of the sun (the clock) and the moon (the coin).
How is it
that the sun and the moon often appear to be the
what happens when the coin is moved nearer or
Place a fifty-cent piece on a piece of paper so that its edge is near one edge of the paper. With a pencil, make a dot on the opposite edge of the paper, and use a ruler to draw straight lines from the dot to each side of the coin.
Now move the coin to the middle of the paper and do the same. Next, move the coin to within 2 inches of the dot, and draw the lines.
Use a protractor to measure the size of each angle. Each angle is the apparent size of the coin as seen from a different distance from the dot. Note that the angle decreases as the distance increases, and vice versa.
determined by the apparent size of an object is
between real size and apparent size is well
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