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Optics of eyeglasses

How can you tell if a movie actor is wearing 'fake' eye glasses? (In other words, wearing glasses that are not needed for conventional purposes of vision correction). Draw pictures to illustrate this.

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(1) If an actor wears "real" glasses but very weak, it may be difficult to tell them from fake, so the point here is to tell whether the glasses are real and quite STRONG or weak/fake

(2) If the glasses are strong, the apparent size of objects behind them - in ...