Quality of light refers to

Options

A. (a) Intensity of light
B. (b) Frequency of light
C. (c) Wavelength of light
D. (d) Duration of light

Answer

To answer the question "Quality of light refers to", we need to analyze the options provided and understand the concept of light in the context of photosynthesis.

### Step-by-Step Solution:

1. **Understanding Light**:
- Light is made up of small packets of energy known as photons. These photons can vary in their energy levels.

2. **Factors of Light**:
- The question provides four parameters: intensity, frequency, wavelength, and duration of light. Each of these can influence photosynthesis, but we need to determine which one specifically refers to the "quality" of light.

3. **Defining Quality of Light**:
- The quality of light is primarily determined by the wavelength of the light. Wavelength affects the energy of photons; different wavelengths correspond to different energy levels.

4. **Role of Wavelength**:
- The amount of energy that each photon carries is determined by its wavelength. Therefore, the relative number of photons at each wavelength is crucial in determining the overall quality of light.

5. **Conclusion**:
- Among the options provided:
- **A. Intensity of light**: Refers to the brightness or strength of light.
- **B. Frequency of light**: Related to the number of waves that pass a point in a given time, but does not directly define quality.
- **C. Wavelength of light**: This is the correct answer as it determines the energy of the photons and thus the quality of light.
- **D. Duration of light**: Refers to the length of time light is present, but not its quality.

6. **Final Answer**:
- Therefore, the correct answer is **C. Wavelength of light**.