A man assaulted his next-door neighbour by pointing a high-powered blue laser light into his eyes, a court heard.

increasing its absorption of the blue light and casting a visible shadow in the shape of the green laser. This shadow met all criteria: it was visible to the naked eye, matched the laser’s ...

The green laser beam thus behaves like an object, blocking the blue light and casting a dark line across the screen. That dark line meets all the criteria for a shadow: it was visible by eye ...