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During refraction, ray of light passes undeviated, then

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medium in other side is rarer

angle of incidence is $90 °$

medium on both sides is same

angle of incidence is $0 °$

answer is A, C.

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Detailed Solution

A ray can pass undeviated when $μ_{1} = μ_{2}$ or the ray is incident normally i.e. angle of incidence is $0 °$ .

Hence, $(1), (3)$ are correct.

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