A plane electromagnetic wave travelling in a perfect dielectric medium of characteristic impedance η 1 is incident normally on its boundary with another perfect dielectric medium of characteristic impedance η 2 . The electric and magnetic field strengths of the incident wave are denoted by E 1 and H 1 respectively whereas E r and H r denote these quantities for the reflected wave, and E t and H t for the transmitted wave. Which of the following relations are correct? 1. E i = η 1 H i 2. E r = η 1 H r 3. E t = -η 2 H t Select the correct answer using the options given below:

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