Question

1. If you are a social worker, how will you handle the case? 
2. What values and principles are you going to apply? 
3. How will you manage the situation? Write your answer below.​

Answer 1

The central white fringe is the zero-order fringe. With monochromatic light all the bright fringes are of the same colour and it is not possible to locate the zero order fringe. Therefore, in order to locate the zero order fringe the biprism is to be illuminated by white light.