9/25/2012
The purpose of this experiment is discovering the image formed by both a convex and concave mirror.
For this experiment, we need a convex mirror, concave mirror, object(marker), ruler and worksheets.
First, we measure the height of the marker which is 11.95+/-0.05cm.
Then we place an object in front of a convex mirror.
The image appears smaller than the object. The image is upright. The image is in front of object and seem further in the mirror. When we move the object closer to the mirror. The image is changing larger till it is as same size as the object.
When we move the object further from the mirror than it was in step 1, we find that the image is changing smaller.
Then we measure the distance between object and mirror which is 50.00+/-0.1cm, and the height of image is 3.9+/-0.1cm. Then we can calculate the magnification is hi/h0=0.326+/-0.01, then due to the relationship between distance and height, we can find the distance between image and mirror is 16.32+/-0.52 cm.In part B, we place the marker in front of a concave mirror.
The image appears bigger than the size of object. The image is upright. The image is in front of the object and it is closer in mirror. When move the object until it is close to the mirror, the image is changing smaller till it is as same as the size of the object. And it is upright. When we move the object much further from the mirror than it was in step1, we find that the image is changing bigger first then become smaller and smaller and from upright to inverted.
We measure the distance between object and mirror is 89.05+/-0.05cm. And the height of image is 24+/-0.1cm. Then we can calculate the magnification is 2+/-0.02cm. Then we also can calculate the distance between image and mirror is 178.85+/-1.6cm.
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