Two lasers enter a limitless space in which there are 6 targets.
One laser enters vertically downward while the other is initially horizontal from the right.

You have 5 mirrors, each of which can deflect a beam at either 45° or 135°.

Each laser beam passes through all targets only once.
Each segment of one laser beam passes exactly through 1, 2 and 3 targets
while those of the other never pass through more than two.

You may care to challenge yourself by fitting all targets into a 4 x 4 grid.
As a further challenge fit the 6 targets into a 4 x 4 grid, use the same rules but use only 4 mirrors.

Note: 1. Brian Smith's Laser Puzzle was the inspiration for this.
2. I acknowledge Brian Smith's thoughts re the use of a 4 mirror version.

@=target, V=vertical start, v=mirrors used by vertical, H=horizontal start, h=mirrors used by horizontal

4x4 with 4 mirrors
.V.|..
-+-@-v
h@-+@H
.@.@..
.|@|..
.v.h..

4x3 with 5 mirrors

..V..
--@h.
..@..
v@+-v
h@@@H
..v..

Note, the beam for the vertical ends at the bottom mirror, which is also the first mirror hit.

And the mailto bug strikes again!!

Edited on December 19, 2007, 1:10 pm

Posted by Brian Smith on 2007-12-19 13:09:09