Part III 4 Image Formation By Refraction Lenses
Part III. 4 • Image Formation By Refraction • Lenses NSCI 122 Part III. 4 1
Image Formation - Refraction Virtual Image Formation By Refraction at Plane Surface • light must go from high to low index NSCI 122 Part III. 4 2
Image Formation - Refraction Virtual Image Formation By Refraction at Plane Surface Phenomenon of Apparent Depth • fish appears to be at depth q while actual depth is d • apparent depth q depends on the viewing angle • fish appears deepest when viewed directly above q ~ d n 2 / n 1 NSCI 122 Part III. 4 3
Demonstration Video: Apparent Depth Watch the demonstration in the lecture video. NSCI 122 Part III. 4 4
Image Formation - Lenses Focal Point and Focal Length of Converging (Positive) Lens rounder lens higher index NSCI 122 Part III. 4 shorter f 5
Image Formation - Lenses Focal Point and Focal Length of Diverging (Negative) Lens rounder lens higher index NSCI 122 Part III. 4 shorter f 6
Image Formation - Lenses Ray Trace of Real Image Formation By a Positive Lens object distance p object height h focal length f image height h’ image distance q Thin Lens Equation Magnification NSCI 122 Part III. 4 7
Image Formation - Lenses Simple Camera • positive lens • object far away real, small, inverted image close to lens NSCI 122 Part III. 4 8
Image Formation - Lenses Simple Projector • positive lens • object close but still outside focal point real, large, inverted image far from lens NSCI 122 Part III. 4 9
Image Formation - Lenses Ray Trace of Virtual Image Formation By a Positive Lens object height h object distance p image height h’ image distance q focal length f NSCI 122 Part III. 4 10
Image Formation - Lenses Simple Magnifier • positive lens • object inside focal point virtual, large, non-inverted image on same side of lens as object q ~ 25 cm gives biggest clear image NSCI 122 Part III. 4 11
Image Formation - Lenses Ray Trace of Virtual Image Formation By a Negative Lens image height h’ focal length f object height h object distance p image distance q NSCI 122 Part III. 4 12
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