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

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Presentation transcript:

Curved lenses 13.1, 13.3 SNC 2D1 Mr. Dvorsky

Diverging lens, Concave shape F

Converging lens, Convex shape

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

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

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

SPECIAL CASES WITH CONVERGING LENSES (p. 377)

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

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

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

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

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

RULES WITH DIVERGING LENSES

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