Quantum reflection is a physical phenomenon involving the reflection of a matter wave from an attractive potential. In classical physics, such a phenomenon is not possible; for instance when one magnet is pulled toward another, you do not expect one of the magnets to suddenly (i.e. before the magnets `touch') turn around and retreat in the opposite direction.
Read more about Quantum Reflection: Definition, Reflection of Slow Atoms, Single-dimensional Approximation, Experiments With Grazing Incidence, Casimir and Van Der Waals Attraction, Efficient Quantum Reflection, Ridged Mirror, Application of Quantum Reflection
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