ìGirl Scouts in MudîWhy does light refract when it enters a slower medium?

• The direction of travel changes when the marching line hits the mud at an angle.

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Now letís add another twist to the marching line. So far the girl scouts were hitting the mud all at exactly the same time. What happens if the marching line hits at an angle?

The result is that the direction of travel also changes because the first girl scout who went into the mud would travel a shorter distance than the girl scout who hit the mud the last.