Duration: 2:47

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(1) Assertion (A) is True, Reason (R) is True; Reason (R) is a correct explanation for Assertion (A)
(2) Assertion (A) is True, Reason (R) is True; Reason (R) is not a correct explanation for Assertion (A)
(3) Assertion (A) is True, Reason (R) is False.
(4) Assertion (A) is False, Reason (R) is True.
Assertion (A): In optical fibre, the diameter of the core is kept small.

Reason (R): This smaller diameter of the core ensures that the fibre should have incident angle more than the critical angle required for total internal reflection.
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