Assertion: In ionospheric reflection, phase change does not occurs with the light wave.
Reason: The ionosphere reflection is similar to the tatol internal reflection is similar to the total internal reflection in miral.

Options

A. 1.If both assertion and reason are true and reason is the correct explanation of assertion.
B. 2.If both assertion and reson are true but reason is not the correct explanation of assertion.
C. 3.if assertion is true but reason is false.
D. 4.If both assertion and reason are false.

Explanation

To solve the question, we need to analyze both the assertion and the reason given in the statement.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that in ionospheric reflection, there is no phase change that occurs with the light wave.
- In general, when light reflects off a boundary, a phase change can occur depending on the refractive indices of the two media involved.

2. **Understanding the Reason**:
- The reason states that ionospheric reflection is similar to total internal reflection (TIR) in a mirror.
- Total internal reflection occurs when light travels from a denser medium to a less dense medium, and it does not involve a phase change of 180 degrees.

3. **Analyzing Ionospheric Reflection**:
- The ionosphere is a region of the Earth's atmosphere that is ionized by solar and cosmic radiation. It can reflect radio waves back to Earth.
- When radio waves reflect off the ionosphere, they do so without a phase change, similar to how light reflects in TIR.

4. **Comparing Assertion and Reason**:
- Since both the assertion and reason are true, and the reason explains the assertion, we can conclude that the assertion is valid because it is supported by the reasoning provided.

5. **Conclusion**:
- Both the assertion and reason are true, and the reason correctly explains the assertion. Therefore, the correct answer is that both the assertion and reason are true, and the reason is the correct explanation for the assertion.

### Final Answer:
Both the assertion and reason are true, and the reason is the correct explanation for the assertion.