$1.$ In class, we have discussed about a corner cube. The corner cube is a retroreflector which reflects an incident beam back on itself regardless of incident direction. Show how this corner cube reflects the incident beam back to itself regardless of incident direction. Hint: Work for one directional retroreflector case then extend the idea into the corner cube case. You don$$t need to use any analytical method to solve this question. Explanation of how this works would be sufficient