The longest visible rays, at the end of the visible spectrum are `7.8 xx 10^(-7)` m in length. Express this length in (i) micrometers and (ii) nanometers

Explanation

To solve the problem of converting the wavelength of the longest visible rays from meters to micrometers and nanometers, we will follow these steps:

### Given:
The wavelength of the longest visible rays is \( 7.8 \times 10^{-7} \) m.

### (i) Convert to Micrometers:
1. **Understand the conversion factor**:
- 1 meter = \( 10^6 \) micrometers.
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