Press play to find out how the light reflected from the mirror and form those three images. You can drag the arrow in the top-right region and find out how the images changed.

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Enjoy the fun of Physics! You can access this simulation online from
Two plane mirror in 90 degree
Designed by Fu-Kwun Hwang (http://www.phy.ntnu.edu.tw/ntnujava/)
Deptartment of Physics, National Taiwan Normal University, Taiwan