To practice reflection, follow the following steps:
- Move the red corners of
the green quadrilateral so
that it becomes what you think is the image of the black
- When you are happy about the position of the
green quadrilateral, slide the
button (at the bottom left of the diagram) to reveal the actual
image (this is blue).
- Did you get it right? If not, can you see your mistake?
- Hide the image (the blue
quadrilateral) using the button.
- Change the shape of the black quadrilateral (this is
called the object) by moving its
red corners and start at step
- Once you have mastered this, change the angle of the mirror
(using the red dots on the
mirror) to either 180º, 45º or 135º (You will not
be able to draw the image accurately using any other angle). I
suggest if you made a few mistakes when the mirror was at
90º, you try first the mirror at 180º. The angle which
the mirror is at is in yellow at the foot of the diagram.
Applet created on 1/22/01 by Jamie
Coventry with CabriJava