Question

How are non-luminous objects visible to the eye?
A. Non-luminous objects give away light
B. Non-luminous objects reflect the light falling on them
C. Non-luminous objects disperse the light falling on them
D. None of the above

Answer 1

Hint:The above problem can be resolved by using the fundamentals of the phenomenon involved in the analysis of the light rays. This includes the terms like dispersion, luminosity and luminosity, along with their several applications. Moreover, the non-luminous objects are the one that never possesses any ability to emit light energy. Rather all is possible when there is bouncing back of light after falling on them.

Complete step by step answer:
The Non- luminous objects never possess any ability to give away the light and hence the option (A) is invalid for the given condition.
On the other hand, the dispersion of light rays after falling on the non-luminous objects is also an invalid condition, as the phenomena of dispersion are also not applicable for non-luminous objects.
But considering the case, when the light rays tend to fall on some non- luminous objects, then these non-luminous objects tend to reflect the eye lens of human eyes and can observe the light rays that fall on them and this reflected light. This comes out to be an appropriate condition.
Therefore, the non-luminous objects visible to the eye because non-luminous objects reflect the light falling on them and option (B) is correct.

Note:Try to understand the fundamentals of non-luminous objects and the reason behind their inability to emit any kind of light energy. Along with this, it is also important to go through the concepts like dispersion of light rays, reflection and deflection along with their critical applications.