Discussion
| List - I | List - II |
|---|---|
| a. 1550 nm | i. 100 GHz |
| b. 0.8 nm | ii. Visible light |
| c. 400-700 nm | iii. Ultra violet |
| d. 200 nm | iv. 193 T Hz |
Answer: A
The correct matching is a-iv, b-i, c-ii, d-iii. The frequency of 1550 nm light is \(c/\lambda = 3 \times 10^{8}/1550 \times 10^{-9} \approx 193\) THz (iv). A wavelength spacing of 0.8 nm near 1550 nm corresponds to \(\Delta f = c\Delta\lambda/\lambda^{2} \approx 100\) GHz (i), the standard channel spacing in dense WDM. 400 to 700 nm is visible light (ii), and 200 nm lies in the ultraviolet (iii).
The other options place visible light or ultraviolet against the wrong wavelengths.
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