Question

please tell me the answers ....................​

Answer 1

Answer:

1. it's b. invisible but makes object on which it falls visible

this is because...

The human eye can only see visible light, but light comes in many other "colors" - radio, infrared, ultraviolet, X-ray, and gamma-ray - that are invisible to the naked eye. On one end of the spectrum there is infrared light , which, while too red for humans to see, is all around us and even emitted from our bodies.

2. option b. position of the light source.