Lens Application Camera Movie Projector Magnifying Glass Compound

Lens Application Camera Movie Projector Magnifying Glass Compound microscope Refracting telescope

Converging Lens - Review When object is beyond 2 F’ F’ O F 2 F

Camera • • Camera uses CONVERGING LENS Object has to be beyond 2 F’ Image captured will be smaller, real image, between F and 2 F Image captured on film or CCD (charged-coupled device)

Movie Projector • Also CONVERGING LENS but works opposite of a camera • The object (on film) must be upside-down and between 2 F’ and F’ • Image captured on screen will be larger, inverted real image 2 F’ F’ O F 2 F

Movie Projector

Magnifying Glass • Use CONVERGING LENS • Object located between F’ and lens • Image will be larger, virtual, on same side as object. 2 F’ F’ O F 2 F

Magnifying Glass

Compound Microscope Uses 2 converging lenses (so much greater magnification) • 1 st lens create a larger, real image (not seen by our eye, as it is inside the tube of microscope) • 2 nd lens create a much larger virtual image EYEPIECE LENS OBJECTIVE LENS OBJECT REAL IMAGE F F’ VIRTUAL IMAGE

Compound Microscope

Refracting Telescope Same principle as compound microscope – uses 2 converging lenses However, object will be FAR AWAY thus incident rays are considered to be parallel

Refracting Telescope 1 st image is larger, inverted real image (not seen as it is located inside the tube of telescope) 2 nd image is larger, virtual image For “terrestrial telescope” – 3 rd lens used to “flip” image upright