Nonluminous objects

Light is a form of energy that gives a sense of vision. Light helps in viewing any object when in returns back from that (reflection of light) to our eyes. We see the objects when the light lights up them. The study of light and its phenomenon is called ‘optics’.
e.g.- We see the pen because the light falling on the pen is reflected back to our eyes.
e.g.- When light enters from a ventilator of a dark room, we see the dust particles of air.