 
			 
			MCQOPTIONS
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				| 1. | For perfect coherent radiation, which one of the following statement is correct? | 
| A. | Both the waves must have single frequencies | 
| B. | The directions of motion of both waves are parallel. | 
| C. | The waves must be collimated | 
| D. | All of these | 
| Answer» E. | |