Question

Laser beams are made of light. In Sci Fi movies, laser beams are often shown as straight bright lines shooting out of a laser gun on a space ship. Why is this scientifically incorrect?

A.

the only way to see the laser beam is for the beam to directly enter our eye

B.

laser beams are emitted at wavelengths too short for anyone to ever see

C.

laser beams travel way too fast (faster than the speed of light) to ever see!

D.

laser beams involve emission from atoms, which don't exist in the vacuum of space

Answer 1

Option A is incorrect - the only way to see the laser beam is for the beam to directly enter our eye

We should never let laser enter the eye. This can cause a injury to the retina, if the laser stays in one spot for a few seconds