U.V rays find application in the purification of water, although it is harmful to human being. Explain.

Explanation

### Step-by-Step Solution:

1. **Introduction to UV Rays**:
- UV (Ultraviolet) rays are a type of electromagnetic radiation. They are present in sunlight and can have harmful effects on human health, such as causing skin cancer.

2. **Harmful Effects of UV Rays**:
- One of the significant harmful effects of UV rays is their ability to damage skin cells, which can lead to skin cancer. This is a serious health risk associated with prolonged exposure to UV radiation.

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