Duration: 2:15

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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): On entering an em wave into a medium with properties, \( \varepsilon_{\mathrm{r}}=2, \mu_{\mathrm{r}}=2 \), the speed of the wave becomes half.
Reason (R): For a medium refractive index can be given by \( n=\sqrt{\mu_{r} \varepsilon_{r}} \), and speed of wave \( v \propto \frac{1}{n} \).
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