Assertion : The edges of the images of white object formed by a concave mirror on the screen appear white.
Reason : Concave mirror does not suffer chromatic aberration.

Options

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

Explanation

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

### Step 1: Understand the Assertion
The assertion states that "The edges of the images of a white object formed by a concave mirror on the screen appear white."

- A white object reflects all colors of light. When an image of a white object is formed by a concave mirror, the light rays reflecting off the object and converging at the image point will still contain all colors of light. Therefore, the edges of the image will also appear white.

### Step 2: Understand the Reason
The reason states that "Concave mirror does not suffer chromatic aberration."

- Chromatic aberration occurs when different colors of light are refracted (or reflected) by different amounts, causing colors to spread out and not focus at the same point. However, concave mirrors reflect light rather than refract it. As a result, all colors of light reflect off the mirror at the same angle, which means there is no separation of colors, and hence no chromatic aberration occurs.

### Step 3: Relate the Assertion to the Reason
Now, we need to determine if the reason correctly explains the assertion.

- Since the concave mirror does not suffer from chromatic aberration, it reflects all colors of light uniformly. This means that the image formed (including its edges) will maintain the white color of the original object. Thus, the reason supports the assertion.

### Conclusion
Both the assertion and the reason are true, and the reason is the correct explanation for the assertion.

### Final Answer
- **Assertion**: True
- **Reason**: True
- **Explanation**: The reason correctly explains why the edges of the image of a white object appear white when formed by a concave mirror.