Sustainable development faces several significant challenges, including:
1. Climate change: The increasing emissions of greenhouse gases are leading to global warming and environmental disruptions.
2. Resource depletion: Overconsumption of non-renewable resources, such as fossil fuels and minerals, poses a threat to future generations.
3. Biodiversity loss: Deforestation, pollution, and habitat destruction lead to a decline in bio-diversity, which is essential for ecosystem balance.
4. Social inequality: Unequal access to resources, education, and opportunities can hinder progress toward sustainable development goals.
| Case No. | Lens | Focal Length | Object Distance |
|---|---|---|---|
| 1 | \(A\) | 50 cm | 25 cm |
| 2 | B | 20 cm | 60 cm |
| 3 | C | 15 cm | 30 cm |