Please refer to the uploaded image for the doubt

Asked by arjunsah797 | 15th May, 2022, 01:18: PM

Expert Answer:

Part (a)
 
Initially disc P1 and disc P2 are oriented so that intensity is maximum . Hence optical axis of P1 and P2 are parallel.
 
If P2 is rotated through 90o , then optical axis are perpendicular to each other.
 
hence we get dark , i.e., extinction is produced
 
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Part (b)
 
If disc P1 is rotated through 90o now, then both optical axis are parallel . Hence the field is bright
 
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Part (c)
 
If disc P2 is rotated through 90o now, then both optical axis are perpendicular . Hence the field is dark

Answered by Thiyagarajan K | 15th May, 2022, 02:16: PM