In refraction of light through a glass slab, the directions of the incident ray and the refracted ray are ______.

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In the refraction of light through a glass slab, the directions of the incident ray and the refracted ray are parallel to each other. Explanation: For refraction to happen the light ray will have to incident obliquely. If the light ray is incident on the glass slab at a zero angle of incidence the ray will travel without any change of direction.

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