Assertion : Absorption spectrum consists of some bright lines separated by dark spaces .
Reason : Emission spectrum consists of dark lines.

Options

A. If both the assertion and reason are true and reason is correct explanation of the assertion .
B. If both the assertion and reason are true but reason is not a correct explanation of the assertion .
C. If the assertion is true but the reason is false.
D. If both assertion and reason are false.

Explanation

To solve the question, we will analyze both the assertion and the reason provided.

### Step 1: Analyze the Assertion
The assertion states: "Absorption spectrum consists of some bright lines separated by dark spaces."

- An absorption spectrum is produced when white light passes through a cooler gas or substance. The gas absorbs specific wavelengths of light, leading to dark lines in the spectrum where the light has been absorbed. Thus, the correct description of an absorption spectrum is that it consists of dark lines on a continuous spectrum, not bright lines. Therefore, the assertion is **false**.

### Step 2: Analyze the Reason
The reason states: "Emission spectrum consists of dark lines."

- An emission spectrum is produced when a substance emits light after being excited. This spectrum typically shows bright lines on a dark background, corresponding to the specific wavelengths of light emitted by the substance. Therefore, the statement that the emission spectrum consists of dark lines is also **false**.

### Conclusion
Both the assertion and the reason are false. Therefore, the correct answer to the question is that both the assertion and reason are false.

### Final Answer
Both assertion and reason are false.

---