Assertion: Ray of light passing through optical centre of a lens goes undeviated.
Reason: Ray falls normal at optical centre and in normal incidence, there is no deviation of light.

Options

A. If both Assertion and Reason are true and the Reason is correct explanation of the Assertion.
B. If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
C. If both Assertion is true, but the Reason is false.
D. If both Assertion is false but the Reason is true.

Explanation

To solve the given question, we will analyze the assertion and the reason step by step.

### Step 1: Understand the Assertion
The assertion states: "A ray of light passing through the optical center of a lens goes undeviated."

- **Explanation**: The optical center (O) of a lens is defined as the point where the principal axis intersects the lens. When a ray of light passes through this point, it does not deviate from its path. This is true for both convex and concave lenses.

### Step 2: Understand the Reason
The reason states: "Ray falls normal at optical center and in normal incidence, there is no deviation of light."

- **Explanation**: The reason provided is partially correct. While it is true that light passing through the optical center does not deviate, the assertion's correctness does not solely rely on the ray falling normal at the optical center. The ray does not necessarily fall at a normal incidence; rather, the equal curvature on both sides of the lens results in the cancellation of deviations.

### Step 3: Conclusion
- The assertion is true: A ray of light passing through the optical center of a lens goes undeviated.
- The reason is false: While the ray does not deviate, it is not accurate to say that it falls normal at the optical center.

### Final Answer
Both the assertion is true, but the reason is false. Therefore, the correct option is that the assertion is true and the reason is false.

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