Question
With what Hertz produced electro-magnetic waves?
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| S. No. | Wavelength Range |
| 1. | 1mm to 700nm |
| 2. | 400nm to 1nm |
| 3. | 1nm to $10^{-3}$ nm |
| 4. | $< 10^{-3}$ nm |
| Lenses | Power (P) | Aperture (A) |
| $L_1$ | 3 D | 8 cm |
| $L_2$ | 6 D | 1 cm |
| $L_3$ | 10 D | 1 cm |