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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): Focal length of a lens for red colour is greater than its focal length for violet colour.

Reason (R): Because \( \frac{1}{f}=(\mu-1)\left(\frac{1}{R}-\frac{1}{R_{2}}\right) \) and \( \mu_{\mathrm{r}}\mu_{\mathrm{v}} \)
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