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# CBSE Class 12-science Answered

Please refer to the uploaded image for the doubt
Asked by arjunsah797 | 15 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 | 15 May, 2022, 02:16: PM

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