Given below are two statements:
Assertion (A): | A double convex lens (\(\mu=1.5\)) has focal length \(10\) cm. When the lens is immersed in water \((\mu=\frac{4}{3})\) its focal length becomes \(20\) cm. |
Reason (R): | \(\frac{1}{f}=\frac{\mu_l-\mu_m}{\mu_m}(\frac{1}{R_1}-\frac{1}{R_2})\) |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
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