MCQOPTIONS
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				| 1. | 
                                    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 | 
| Answer» B. pass into a medium of different dielectric constant | |