Across
- 3. Distance per unit time
- 6. Converging lens
- 9. Place where the image in formed in the eye
- 10. Unit of measuring power
- 12. Long sightedness
- 13. study of matter and its relation to energy
- 14. Has the same function in a human eye as a diaphragm in a camera
- 15. Anything that occupies space and has mass
- 17. Short sightedness
Down
- 1. Distance between two points
- 2. Mass per unit volume
- 4. Defect of a simple cell
- 5. SI unit of work
- 6. Diverging lens
- 7. Rate of change of displacement
- 8. Unit of current
- 11. Unit of time
- 16. Measure of a surface