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(a) How can you bend light away from the normal? (b) How must light travel out of a substance if it is not going to be refracted?

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(a) How can you bend light away from the normal?

(b) How must light travel out of a substance if it is not going to be refracted?

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(a) By making the light enter from a denser medium to a rarer medium.

(b) Incidence should be at right angle to the surface of substance.

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