If you did not see any light, it means that the room is dark and you could injure yourself. Sit down in a room and turn off the lights. Try to walk around without injuring yourself. This is especially true if it's a room that is new to you and has a lot of stuff on the floor.
a red light
A green light
If there is no light you can not see. There is only blackness. This is quite disconcerting. If you put your hand in front of your eyes you can not see it. If the room is dark ie no light then you can not see.
This is a simple answer. Our eyes require the reflection of white light from an object in order to see it. If there is zero light in a room that is totally dark we can see nothing.
are physically present in the same room and your eyes are able to see each other due to light reflecting off each other's faces and entering your eyes, allowing you to perceive the other person visually.
You cannot see objects in a dark room because there is insufficient light for your eyes to detect them. Vision relies on light entering the eye and being processed by the brain; without light, the photoreceptor cells in the retina cannot function. In darkness, the lack of illumination means that the objects do not reflect light toward your eyes, rendering them invisible. Additionally, your brain requires visual information to form images, which is absent in complete darkness.
See discuss question.
so you can see what is in the room
The wavelengths are corresponded to the color of the light. A blue object will reflect any light radiation expect the color blue. It will absorb the blue light.
by going in a dark room and see if it have lot of heat to light up the room
Darkness is the absence of light. If you turn out the light in your room, for example, your room will contain the same things as it did while there was light, but you simply can't see them.
Because in order to see you need light. You need light because light reflects off things and bounces back to your eyes, and that's how you see things. So if there isn't any light in a dark room then light can't bounce back and you can't see the words