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In figure, light refracts from material ...

In figure, light refracts from material 1 into a thin layer of material 2, crosses that layer, and then is incident at the critical angle on the interface between materials 2 and 3.

(a) What is the angle `theta`?
(b) If `theta` is decreased, is there refraction of light into material 3 ?

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In figure, light refracts from material 1 to a thin layer of material 2, crosses that layer, and then is incident at the critical angle on the interface between materials 2 and 3. (a) What is the angle theta ? (b) if theta is decreased, is there refraction of light into material 3?

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