These question consists of two statements each printed as Assertion and Reason. While answering these question you are required to choose any one of the following five responses.
Assertion: If a body is good absorber of green light then it will be good reflector or red light.
Reason: At a given temperature, the ratio of emissive power to absorptive power is same for all substances.

Options

A. If both Assertion and Reason are correct and Reason is also a good absorber of radiation at a given wavelength.
B. If both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.
C. If Assertion is true but Reason is false
D. If Assertion is false but Reason is true.

Explanation

To solve the question, we need to analyze both the Assertion and the Reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states: "If a body is a good absorber of green light, then it will be a good reflector of red light."
- This statement is based on the principle of absorption and reflection of light. A good absorber of one wavelength (green light, in this case) is typically a poor reflector of that same wavelength. Therefore, if a body absorbs green light well, it is unlikely to reflect red light well.
- Hence, the assertion is **false**.

2. **Understanding the Reason**:
- The reason states: "At a given temperature, the ratio of emissive power to absorptive power is the same for all substances."
- This statement is true and is based on Kirchhoff's law of thermal radiation, which states that for a body in thermal equilibrium, the emissive power (the ability to emit radiation) and absorptive power (the ability to absorb radiation) are related.
- Therefore, the reason is **true**.

3. **Conclusion**:
- Since the assertion is false and the reason is true, we can conclude that the correct response is that the assertion is false, and the reason is true.

### Final Answer:
The correct option is **Option 4**: Assertion is false, Reason is true.