Ray 1. Incident ray parallel to the principal axis

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Presentation transcript:

Ray 1. Incident ray parallel to the principal axis “Ray Tracing – Concave lens” F Object Principal axis 1 2 Image Ray 1. Incident ray parallel to the principal axis - emerges from the focal point Ray 2. Incident ray towards the focal point - emerges parallel to the principal axis NB: Both emerging rays diverge away from one another – no real image formed Trace emerging rays backwards to the intersection point to find the image (Image is upright, diminished & virtual)

“Ray Tracing – Concave lens” Object placed at beyond double the focal length (>2f) Object Principal axis F F Image

“Ray Tracing – Concave lens” Object placed at double the focal length (2f) Object Principal axis F F Image

“Ray Tracing – Concave lens” Object placed between the focal length (f) and double the focal length (2f) Object Principal axis F F Image

“Ray Tracing – Concave lens” Object placed at the focal length (f) Principal axis F Image F

“Ray Tracing – Concave lens” Object placed between the focal length (f) and pole of mirror Object Principal axis F Image F

“Ray Tracing – Concave lens” Summary Table Object position Image description Type Orientation Size Magnification >2f Virtual Upright Diminished  0.35 2f  0.40 Between 2f & f  0.45 f 1/2 Between f & pole Enlarged  0.6