Definition of a Luminous Object

A luminous object refers to an object that emits its own light due to a process called luminescence. This light can be visible to the human eye or emitted in other forms of electromagnetic radiation, such as infrared or ultraviolet.

Explanation of the Given Example

The correct answer, option 'A', is a star. Stars are considered luminous objects because they generate and emit their own light through nuclear fusion processes occurring within their cores. As a result, stars shine brightly and can be observed from vast distances.

Comparison with Other Options

Let's briefly analyze the other options given to understand why they are not considered luminous objects.

- Smooth Surface: A smooth surface, such as a polished table or wall, does not emit light on its own. It can only reflect or scatter light that falls upon it. In this case, the smooth surface acts as a non-luminous object.

- Mirror: Similar to a smooth surface, a mirror also does not emit its own light. Instead, it reflects light, allowing us to see our reflections. Therefore, a mirror is also considered a non-luminous object.

- Cloth: Cloth, like most objects, does not generate light by itself. It can only reflect or absorb light. Hence, cloth is not a luminous object.

Conclusion

In conclusion, a star is an example of a luminous object because it emits its own light through nuclear fusion processes. This distinguishes it from non-luminous objects, such as smooth surfaces, mirrors, and cloth, which rely on reflecting or absorbing light from external sources.

Because , star is otherwise called as sun. So, sun is an luminous object so star is also a luminous object

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