Question

Scientists sometimes refer to “invisible light”. What other forms of energy are like light but not visible to the
human eye?

Answer 1

1. Humans are able to see those lights only which fall in visible region.
2. There are other lights as well which don't lie in visible region , hence we are not able to see them and are referred as invisible lights.
3. Other lights for example radio waves, microwaves, infrared radiation, ultraviolet rays, X-rays and gamma rays can not be seen with eyes.