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When a ray of light passes from air into glass, is the angle of refraction greater than or less than the angle of incidence?
When a ray of light passes from air (rarer medium) into glass (dneser medium), it bends towards the normal. Therefore, the angle of refraction is less than the angle of incidence.
Explanation
Refraction is the process of bending of light, when light travels from one medium to another medium. 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 water (slower medium or optically denser medium), its speed decreases and bends towards the normal, making the angle of refraction less than the angle of incidence.
2. 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 greater than the angle of incidence.
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