Light is

Options

A. visible part of electromagnetic spectrum
B. non-visible part of electromagnetic spectrum
C. IR part of electromagnetic spectrum
D. UV part of electromagnetic spectrum

Answer

To answer the question "Light is," we will analyze the provided options step by step.

### Step-by-Step Solution:

1. **Understanding the Concept of Light**:
- Light is a form of energy that is visible to the human eye. It is part of the electromagnetic spectrum.

2. **Identifying the Electromagnetic Spectrum**:
- The electromagnetic spectrum includes a range of electromagnetic waves, which are categorized based on their wavelengths. This spectrum includes radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays.

3. **Defining Visible Light**:
- Visible light is the portion of the electromagnetic spectrum that can be detected by the human eye. It has a specific range of wavelengths.

4. **Determining the Wavelength Range of Visible Light**:
- The wavelength of visible light ranges from approximately 380 nanometers (nm) to 750 nanometers (nm).

5. **Evaluating the Options**:
- **Option 1**: Visible part of the electromagnetic spectrum - This is correct as it refers to the range of light that can be seen by the human eye.
- **Option 2**: Non-visible part of the electromagnetic spectrum - This is incorrect as it refers to wavelengths outside the visible range.
- **Option 3**: IR (infrared) part of the electromagnetic spectrum - This is incorrect as infrared light is not visible to the human eye.
- **Option 4**: UV (ultraviolet) part of the electromagnetic spectrum - This is incorrect as ultraviolet light is also outside the visible range.

6. **Conclusion**:
- Based on the analysis, the correct answer is that light is the visible part of the electromagnetic spectrum.

### Final Answer:
Light is the visible part of the electromagnetic spectrum.