#7 Concave and Convex Mirrors

There are three types of mirrors, plane, concave and convex.

 convex

 concave

plane

First, we looked at convex mirror.
The first interesting thing is that the image appear on the mirror is smaller than the actual size of object. Another interesting is that the image is always upright. When we move the object closer to the mirror, the image will become bigger, but still smaller than the object. Vice verse,  when we move the object father away from the mirror, the image seem to become smaller.

Next, we learned how to draw the ray diagram for convex mirror

buy drawing the rays, we can estimate the size of image and calculate out the magnification
for this diagram, the object size is 5.6cm, the image size is 1.9cm   the magnification is 1.9/5.6=0.34


The second part of the experiment is to understand the how concave mirror work
The image is always inverted unless you put the object within the focal point. When you put the image in the focal point, the image will be infinite large, which you cannot see the any image. When you move the object away from the mirror, the image will become smaller. After know the behaviors of concave mirror, we drew the ray diagram for concave mirror

the image is 0.75cm , the object is 3.1cm, thus the magnification is 0.242