The incident light deviates from its rectilinear path as it passes from one medium to another
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When light changes medium, its speed changes; refractive index is ratio of speed of light in any material medium to speed in vacuum.
When it enters an optically denser medium its speed decreases and when it comes out in optically rarer medium, is speed again increases according to refractive index of the medium.
It is a property of light that it chooses a shorter path than normal, while travelling through an optically denser medium. So if light goes into glass slab from air, then it bends away from its actual path and chooses a shorter path --- you can see it in your book. When it comes out of the glass slab, it deviates away from normal because light's speed has increased to normal. So emergent ray becomes parallel ray to the actual path of incident ray.
When it enters an optically denser medium its speed decreases and when it comes out in optically rarer medium, is speed again increases according to refractive index of the medium.
It is a property of light that it chooses a shorter path than normal, while travelling through an optically denser medium. So if light goes into glass slab from air, then it bends away from its actual path and chooses a shorter path --- you can see it in your book. When it comes out of the glass slab, it deviates away from normal because light's speed has increased to normal. So emergent ray becomes parallel ray to the actual path of incident ray.
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