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A ray of light travelling in air is incident on a parallel-sided glass slab (or rectangular glass slab). Draw a ray-diagram indicating the change in its path in glass.
When a ray of light travelling in air is incident on a parallel-sided glass slab (or rectangular glass slab), it bends towards the normal.
Explanation
The angle of refraction or the amount of bending of light depends on the refractive index
1. When light passes through a low refractive index, like air (here water) (faster medium or optically rarer medium) to a high refractive index, like glass (slower medium or optically denser medium), its speed decreases and bends towards the normal, making the angle of refraction smaller than the angle of incidence.
2. When light passes through a high refractive index, like glass (slower medium or optically denser medium) to a low refractive index, like air (here water) (faster medium or optically rarer medium) its speed increases and bends away from the normal, making the angle of refraction larger than the angle of incidence.
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