Definition of Non-Luminous Objects
Non-luminous objects are those that do not emit their own light. Instead, they can only be seen when they reflect light from a luminous source. Understanding non-luminous objects is essential in various fields such as physics, astronomy, and environmental science.
Example of a Non-Luminous Object
One common example of a non-luminous object is a tree. Trees do not produce light on their own; instead, they reflect sunlight.
Characteristics of Non-Luminous Objects

• Dependence on Light Sources: Non-luminous objects rely on external light sources to be visible. Without light, they are essentially invisible.
• Reflection of Light: These objects can reflect light in various ways, which allows us to perceive them. For instance, when sunlight hits a tree, the leaves' surface reflects that light, making the tree visible to our eyes.
• Examples Beyond Trees: Other examples include rocks, buildings, and furniture. Each of these objects can be observed only when illuminated by light sources like the sun, lamps, or other luminous bodies.

Importance in Science and Nature
Understanding non-luminous objects contributes to our comprehension of natural phenomena and the interaction of light with matter. For example, in astronomy, non-luminous celestial bodies, such as planets and moons, are observed due to the sunlight they reflect.
Conclusion
In summary, non-luminous objects are integral to our environment and understanding of light. By recognizing their properties and examples, we can better appreciate the world around us.