Reflection — When Light Comes Back
Reflection is one of those words we learnt early in school but use every day without thinking about it.
When light strikes a surface, some of it can bounce back. This is reflection.
A polished mirror reflects light in an orderly way, allowing us to see a clear image. A rough wall also reflects light, but in many directions, so we don't see our reflection.
Water can behave like a mirror when its surface is calm. That is why a still lake can appear to contain a second sky.
And here is the distinction worth remembering:
The sky is not blue because water reflects it.
But calm water can reflect the blue sky.
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