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Electromagnetic Field Theory - Engineering

Q1:

Refraction of electromagnetic waves occurs when they

A pass through a small slot in a conducting plane

B pass into a medium of different dielectric constant

C are polarized at right angles to the direction of propagation

D encounter a perfectly conduction surface

ANS:A - pass through a small slot in a conducting plane

Refraction is due to change in dielectric and wavelength, so I think its B.