The quickest path via a reflection

Suppose that the direct route from A to B is blocked by a screen, but that there is a possibility of getting around the screen via reflection at a mirror, as shown in Figure 2.1. Which is the shortest and quickest remaining route from A to B?

Figure 2.1 The direct route is blocked, but a mirror provides another way.

Some reasonable suggestions:

1. The point of reflection is C, directly under the screen.

2. The point of reflection is D, such that the angle between the ray and the mirror is the same for the incident and reflected rays.

3. The point of reflection is E, halfway horizontally between A and B.

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