2881. Short-sightedness can be corrected by using ______?
✅ A. Concave lens
✅ A. Concave lens
✅ B. Carbon
✅ B. Ionizing Radiations
✅ A. Zoonoses
✅ B. Period
✅ D. 33
✅ C. Troposphere, Stratosphere, Mesosphere, Ionosphere
✅ D. Fermentation
✅ B. Steel
✅ B. Erythrocytes