Heron's Principle of Reflection/Examples

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Examples of Use of Heron's Principle of Reflection

Journey to the River

Mary, who is standing at a point $S$, wants to walk to the point $T$.

Herons-Reflection-Principle-River.png

However, first she wants to take a drink of water from a river.

She wants to walk as short a distance as possible.

To what point on the riverbank should she walk?