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Four materials are next to each other, and the change in the index of refraction from one to the next is the same. (In other words, IF the index of refraction of region A is 1.5, then the index of refraction of region B is 2 and the index of refraction in region C is 2.5, and so forth.) What is the index of refraction of region D?
You can move the beam source by click-dragging it, but you can't change the angle of the light.
You can move the green protractor by click-dragging on the lower green hotspot.
You can measure angles (in degrees) by click-dragging on the upper green 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.