1. Curved lenses 13.1, 13.3
SNC 2D1
Mr. Dvorsky

2. Diverging lens, Concave shapeF

3. Converging lens, Convex shape

4. Lens diagram set up VIRTUAL FOCAL POINT object O 2F 2F’ F’ F 2F F
OPTICAL CENTRE

5. HOW DO WE KNOW WHICH SIDE IS REAL AND WHICH SIDE IS VIRTUAL?
REMEMBER THAT PREVIOULY THE REAL SIDE IS WHEREVER THE OBSERVER WHO IS SEEING THE IMAGE IS LOCATED…WHEN DEALING WITH LENSES, WHICH SIDE IS THIS?
HOW DO WE KNOW WHICH SIDE IS REAL AND WHICH SIDE IS VIRTUAL?
REAL
VIRTUAL
object O 2F
2F’ F’ F 2F F
OPTICAL CENTRE

6. RAY #1: Any ray that is parallel to the PA is refracted through the F
RAY #2: Any ray that pass through F is refracted parallel to PA
RAY #3: Any ray that passes through O continues through
USE SAME CONCEPTS AS THE ONES USED IN MIRRORS
object O 2F
2F’ F’ F 2F F

7. SPECIAL CASES WITH CONVERGING LENSES (p. 377)

8. Object beyond 2F’: image is real, inverted, smaller

9. Object at 2F’: image is inverted, same size, real

10. Object between F’ and 2F’: image is beyond 2F, real inverted, larger

11. Object at F’: no image
Light rays remain parallel and don’t converge thus no image formed O 2F
2F’ F’ F 2F F

12. Object between lens and F’: image is virtual, erect, larger

13. RULES WITH DIVERGING LENSES

14. RAY #1: Any ray that is parallel to the PA appears to be refracted through the F’
RAY #2: Any ray that appears to pass through F is refracted parallel to PA
RAY #3: Any ray that passes through O continues through
object 2F
2F’ F’ F 2F F