Assertion: Dentists make use of concave mirror to view the magnified image of teeth.
Reason: A concave mirror is more cost effective available.

Options

A. If both assertion and reason are true 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 reason are false.

Answer

### Step-by-Step Solution:

1. **Understanding the Assertion**: The assertion states that dentists use concave mirrors to view a magnified image of teeth. This is true because concave mirrors can produce a magnified virtual image when the object (in this case, teeth) is placed between the mirror's pole and its focus.

2. **Understanding the Reason**: The reason provided is that a concave mirror is more cost-effective. This is where the statement becomes questionable. While concave mirrors are commonly used in dental practices, they are not necessarily more cost-effective than other types of mirrors. The primary reason for their use is their ability to produce a magnified image, not their cost.

3. **Conclusion**: Since the assertion is true (dentists do use concave mirrors for magnification), but the reason is false (the cost-effectiveness of concave mirrors is not the reason for their use), the correct relationship is that the assertion is true and the reason is false.

4. **Final Answer**: Therefore, the answer to the question is that the assertion is true, and the reason is false.