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Draw a labelled ray diagram to show how a ray of light is refracted when it passes:(a) from air into an optically denser medium.(b) from an optically denser medium into air.
(a) Refraction of light ray when it passes from air to an optically denser medium:
(b) Refraction of light ray when it passes from an optically denser medium to air:
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 (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.
2. When light passes through a high refractive index, like glass (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.
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