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Thursday, October 3, 2019
कौन-सी प्रक्रिया प्रकाश और ध्वनि दोनों में घटित नहीं होती है ?
(A) ध्रुवण
(B) विवर्तन
(C) अपवर्तन
(D) परावर्तन
Ans- A
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