Diagram 2: obstacle blocking part of the light rays, resulting in a sharper and
... the refracted light ray. c4d22a66b4bf92bd56f6fa269ee200df.png
Light passing through a glass slab.
4. Reflection and refraction at a discontinuity. When a wave
When light refracts and changes direction as it passes through different mediums, it can distort what we see. Think back to the pencil or straw in a glass ...
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A light ray passing from one medium to another.