A ray of light travelling in water emerges into air. Draw a ray-diagram indicating the change in its path.

When a ray of light travelling in water enters air, it bends away from the normal.

 Explanation

The angle of refraction or the amount of bending of light depends on the refractive index  of the two media.

When light passes through a high refractive index, like water (slower medium or optically denser medium) to a low refractive index, like air (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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Updated on: 10-Oct-2022

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