We see objects in a dark room due to the emission of light photons which are sensitive to our eyes.
Darkness is simply a terminology used to describe the absence of light. Visible light to human is a component of the electromagnetic spectrum. Our eyes have receptors that picks the photons which light releases.
The particles of light are called photons.
When a torch is shines. It produces light due to emission of light by excitation of the metal in the bulb.
The light is in form of photons that spreads and travels in all direction in a room.
When they impinge on other bodies, they cause them to excite and release their own photons
Photons from the different parts helps to depict an object as it is.
The photo-receptors in our eyes picks up the photon and interprets it in our visual faculty.
