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Please wait for the animation to completely load.
A beam of light passes through four different materials (A, B, C, D). How does the speed of light in each material compare with each other (i.e. rank them from slowest to fastest)?
You can move the beam source up and down by click-dragging it.
After clicking on the beam source, you can change the angle of the beam by click-dragging on the green hotspot.
You can move the pink protractor by click-dragging on the lower pink hotspot.
You can measure angles (in degrees) by click-dragging on the upper pink hotspot of the protractor. The angle is measured with respect to the positive x-axis.
The (x, y) position of the mouse pointer is given in the lower left corner. The origin is at the center of the left edge.
Position is given in centimeters.