Assertion `:` The colour of the green flower seen through red glass appears to be dark.
Reason `:` Red glass transmits only red light.

Options

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

Explanation

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

### Step 1: Understand the Assertion
The assertion states that "the color of the green flower seen through red glass appears to be dark." This means that when light from a green flower passes through a red glass, the flower does not appear green but rather dark.

**Hint:** Consider how colors interact with filters and what happens to light of different colors when it passes through colored glass.

### Step 2: Understand the Reason
The reason states that "red glass transmits only red light." This implies that when light of other colors (like green) tries to pass through the red glass, it cannot, and thus, it does not reach our eyes.

**Hint:** Think about the properties of colored glass and how they filter light based on wavelength.

### Step 3: Analyze the Interaction
When green light (which has a shorter wavelength than red light) hits the red glass, the red glass does not allow the green light to pass through because it only transmits red light. As a result, the green flower appears dark since the light that would normally make it appear green is blocked.

**Hint:** Recall that colors are perceived based on the wavelengths of light that reach our eyes.

### Step 4: Conclusion
Both the assertion and the reason are correct. The assertion correctly describes the phenomenon of the green flower appearing dark when viewed through red glass, and the reason accurately explains why this happens: the red glass only allows red light to pass through.

### Final Answer
Both the assertion and the reason are correct, and the reason correctly explains the assertion.

**Correct Option:** Assertion is true, Reason is true, and Reason explains Assertion.