Introduction:
Non-luminous objects are objects that do not emit light on their own. They can only be seen when light falls on them and is reflected into our eyes. However, there are ways in which non-luminous objects can be made luminous. In this response, we will explore some of these methods in detail.

Methods to make non-luminous objects luminous:

1. Incandescent light sources:
Incandescent light sources, such as electric bulbs, can be used to make non-luminous objects luminous. When the light from the bulb falls on an object, it illuminates the object and makes it visible. This is the most common method used in our daily lives to make objects luminous.

2. Fluorescence:
Fluorescence is a phenomenon where certain substances absorb light of one wavelength and emit light of a different wavelength. By using fluorescent materials, non-luminous objects can be made luminous. For example, fluorescent paints or pigments can be applied to objects, and when these objects are exposed to ultraviolet light, they emit visible light, making them luminous.

3. Phosphorescence:
Phosphorescence is similar to fluorescence, but the emitted light continues to be emitted even after the light source is removed. Phosphorescent materials can be used to make non-luminous objects luminous. This is seen in objects like glow-in-the-dark stickers or watch dials, which absorb light and emit it slowly over time.

4. Bioluminescence:
Bioluminescence is the production and emission of light by living organisms. Certain organisms, such as fireflies, jellyfish, and some fungi, have the ability to emit light. By incorporating these organisms or their bioluminescent substances into non-luminous objects, they can be made luminous.

5. Chemical reactions:
Certain chemical reactions can produce light. For example, in a glow stick, two chemicals are mixed, and a chemical reaction occurs, resulting in the production of light. By using similar chemical reactions, non-luminous objects can be made luminous temporarily.

Conclusion:
Non-luminous objects can be made luminous using various methods such as using incandescent light sources, fluorescence, phosphorescence, bioluminescence, and chemical reactions. These methods enable non-luminous objects to emit light and become visible even in the absence of an external light source.