what do you think you know about physics, physics is the study of matter under the effect of energy, but does this includes solid states bodies, atoms at ground states, object at microscopic size or object moving faster than light? these and more is what prompt me to ask again what is physics?
light refract by changing its direction when
it enters a different medium, when the edium is lighter it moves away from the
normal and when the medium is denser it moves toward the normal.
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