Official PYQ · 2023Set 1 · Q50Plane Waves and PropertiesNAT2 marks

GATE EC 2023 Set 1 Q50 — Plane Waves and Properties

A transparent dielectric coating is applied to glass $\left(\varepsilon_r=4, \mu_r=1\right)$ to eliminate the reflection of red light $\left(\lambda_0=0.75 \; \mu \mathrm{m}\right)$ . The minimum thickness of the dielectric coating, in $\mu \mathrm{m}$ , that can be used is_____________(rounded off to two decimal places).

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Answer: 0.12:0.14

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Published 10 Oct 2026

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