When you see a clock from the back (mirror image), left and right are reversed. This is equivalent to a horizontal mirror reflection.

A clock seen from behind at 8:15:

In mirror image, the hour hand at 8 appears at \(12 - 8 = 4\. The minute hand at 15 min (pointing to 3) appears at the 9 position (45 min).

So the actual time = 4:45.

Rule: Mirror time + Actual time = 12:00 (for hour) and 60 (for minutes). Hour: \(12 - 8 = 4\. Minutes: \(60 - 15 = 45\. Actual time = 4:45.