path-reversal principle

path-reversal principle
\\ˈ ̷ ̷ ̷ ̷ˈ ̷ ̷ ̷ ̷-\ noun
: a statement in optics: if light traverses a given course it can traverse the same course in the opposite direction and hence it follows that any object point and its real image are interchangeable

Useful english dictionary. 2012.

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