Why is it neccessary that if there is no light then everythimg is black and when we close our eyes we see everthing black usually when we are in black room??
- Light comes from a light source
- The light then hits an object
- The light then bounces off the object into your eye
- Your eye sends a signal to your brain. Your brain then figures out what you're seeing
So in order for us to see, you need light getting into your eye (step 3). If you're in a dark room you have no light source, so no sight (no step 1). If you shut your eyes, you're stopping light from getting into your eye (no step 3). When there's no light getting to your eye, the eye tells this to your brain. So your brain just sees black (the absence of light).
Duree, G. (2011). Optics for Dummies. p. 67.
Adamson, Peter. (7 July 2016). Philosophy in the Islamic World: A History of Philosophy Without Any Gaps. p. 77.