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Q. No.A thin equi-convex lens of refractive index \(1.2\) is dipped in oil of index \(1.44.\) The lens has a power of \(2\) D (in air). When it is immersed in the oil, the focal length of the lens becomes:
| 1. | \(50\) cm | 2. | \(-50\) cm |
| 3. | \(-50/1.2\) cm | 4. | \(-50 \times1.2\) cm |
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Subtopic: Â Lens Makers' Formula |
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