When a light ray enters from a rarer medium to denser medium at zero angle of incidence?

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A light ray is travelling from denser to rarer medium. The angle of incidence is equal to the critical angle. Then which of the following statements is/aretrue?

The angle of refraction is 90 degrees.

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The refracted ray passes along the boundary separating the two medium.

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The incident ray bounces back to the denser medium.

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The incident ray passes undeviated from denser medium to rarer medium.

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