Question

i had to delete this haha sorry

Answer 1

Not quite getting the end of the problem, where they give the specification of the answer.

Answer 2

Consider one square of the grid. It includes a vertical strip, a horizontal strip, one horizontal gap, and one vertical gap. Let me try to draw a picture.....

Answer 3

Note that the light only comes through in the rectangle marked with an *; in the other parts, it is blocked by the vertical strip, the horizontal strip, or both.