Question
A person cannot see distant objects clearly. His vision can be corrected by using the spectacles containing:
- Concave lenses.
- Plane lenses.
- Contact lenses.
- Convex lenses.
Explanation:
Concave lenses are used to correct the defect of vision and enable the person to see distant objects clearly.
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| Metal rod | Number of paper clips picket uo when thre is a current in the coil | Number of paper clips attracted when the current is switched off |
| (a) | 1 | 0 |
| (b) | 20 | 2 |
| (c) | 35 | 0 |
| (d) | 35 | 30 |