Overheard: difference between incoherent and coherent light

Physics 205B, spring semester 2012
Cuesta College, San Luis Obispo, CA

(Overheard during a recap of the results of an online reading assignment, at the start of a lecture on wave optics.)

Instructor: "The difference between an incoherent light source and a coherent light source is...?"

Student: (Beat.) "...The 'in?'"

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