Given below is a list of E.M. spectrum and its use. Which one does not match?

Options

A. U.V. rays - finger prints detection
B. I.R. rays - Secret writing on ancient walls
C. X - rays - Atomic structure
D. Microwaves - forged document detection

Explanation

To solve the question regarding the electromagnetic spectrum and its uses, we will analyze each option provided and determine which one does not match correctly.

### Step-by-Step Solution:

1. **Identify the Uses of Each Type of Electromagnetic Wave**:
- **UV Rays**: Used for fingerprint detection in forensic labs.
- **IR Rays**: Used to reveal secret writings on ancient walls.
- **X-Rays**: Used to study atomic structures and bone structures.
- **Microwaves**: Listed for forged document detection.

2. **Analyze Each Use**:
- **UV Rays**: This is a correct match. UV rays are indeed used in forensic labs for fingerprint detection.
- **IR Rays**: This is also a correct match. Infrared rays can be used to reveal hidden writings on ancient walls.
- **X-Rays**: This is a correct match as well. X-rays are commonly used in medical imaging and can help in studying atomic and bone structures.
- **Microwaves**: This is where the mismatch occurs. Microwaves are not typically used for forged document detection; rather, UV rays are used for this purpose.

3. **Conclusion**:
- The option that does not match correctly is **Microwaves for forged document detection**. The correct use for forged document detection is UV rays.

### Final Answer:
The option that does not match is **Microwaves for forged document detection**.

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