यदि काँच-वायु का क्रान्तिक कोण 8 हो, तो वायु के सापेक्ष काँच का अपवर्तनांक होगा -
(a) sin θ
(b) cosec θ
(c) sin² θ
(d) 1/sin² θ
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Answer:
option b......
cosec theta
................
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