Lenses This Presentation was used for Year 12 students.

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Presentation transcript:

Lenses This Presentation was used for Year 12 students. Note: This PowerPoint is one of over 60 that were developed and used at John Paul College, Rotorua between 1996 and 2002 by D Bradley. They were primary designed as teacher directed resources.

The word “lens” comes from the Latin word for lentils. Picture of lentils.

Lenses Diverging Lens Or Double Concave lens Converging Lens Or Virtual Focal point! Diverging Lens Or Double Concave lens Converging Lens Or Double Convex lens F F f f

Lens = refraction x2

Converging Lens Practical Activity Equipment: meter ruler candle Converging lens (f ~ 20 cm ???) Object location do > 2f do = 2f 2f > do > f For the 3 object locations listed ~ Sketch a ray diagram ~ state the nature of the image ~ record di (so as to be able to calculate f) do = f do < f Investigate the image produced for

Light passes through a lens Ray Tracing for Lenses Light passes through a lens There is a focal point on both sides of a lens Converging Lens: Ray #1: Parallel to the axis Refracts through F Ray #2: Through F Refracts parallel to axis Ray #3: Through Center of lens undeflected

Ray diagrams Inverted Real Enlarged Double Convex Converging Thin Lens: do > f Inverted Real Enlarged Real Image Ray diagrams

Example: Camera

Example: Projector

See 5 Lens applet

Find the focal length of a converging lens by holding it up to a window. (See how far away from the lens you need to hold a piece of paper to focus the image on the paper.)

A camera with a focal length of 50 mm takes a photograph of a 100 m tall building from 350 m away. How tall is the image on the film?

Converging Thin Lens: do < f Double Convex Converging Thin Lens: do < f f f ‘ Virtual Upright Enlarged R1 R2 do di

Example: Magnifying Glass Web Link: Ray tracing

Object distance > 2f: Image is real, smaller, and inverted Results: Ray Tracing for Converging Lenses (in each case, draw in the 3 rays for practice) Object distance > 2f: Image is real, smaller, and inverted F 2F Object between f and 2f: Image is real, larger, inverted F 2F Object between f and lens: Image virtual, larger, upright F 2F