Question

We can see a non-luminous object when light:
A) Emitted by the objects falls on the eye.
B) Is reflected from the object towards our eye.
C) Completely passes through the object.
D) Gets completely absorbed by the object.

Answer 1

Luminous is defined as the brightness of an object. The SI unit of luminous is candela. If we can see any object then it means that either the light is coming from that object or the object is reflecting the light coming from any other object.

Complete step by step solution:
It is asked in the problem that how can we see a non-luminous object. The objects which have their own light shines bright and the light coming out from them enters the eye ball of the human eye and the image of that object is formed on the retina and we can see that object. The intensity of that object depends upon the distance of the luminous object from the human eye.
The objects which are non-luminous reflect the light coming from the other source and striking them and this reflected light gets to the eyeball of the human eye and then the image of that non-luminous object is formed and then we can see the objects which do have their own light.
If light falls on a black surface then most of the light is absorbed and we cannot create a sharp image of the reflecting surface but if the object is white painted then most of the light gets reflected from the object and a sharp image is formed on the retina of the eyeball.

The correct answer for this problem is option B.

Note: The object colour is decided by the fact only that which colour is reflected by the object when the light strikes that object. The phenomenon of reflecting is responsible for the visibility of the non-luminous objects.