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## PowerPoint Slideshow about ' Converging Lenses' - nida

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Presentation Transcript

Lenses

- A lens is a thin transparent piece of glass or plastic that has at least one curved side
- The sides can be concave, convex or both

Lenses

- A lens changes the direction in which light
- If the light rays come together it is a converging lens, if the rays move apart it is a diverging lens

Our eyes have lenses

- Our eye uses a lens to focus an image of an object on the retina of the eye
- The brain then interprets that image (one more “flip”)

Vision correction using lenses

Diverging lens – used to correct short-sightedness

Converging lens – used to correct farsightedness

Converging lens

- Because light can travel in both directions through a lens there are two focal points – one on either side of the lens

Draw a straight line through the centre of the converging lens – this is the axis of symmetry

principalaxis

F

F1

Drawing Ray Diagrams

- Step 1
- Draw a straight line (the axis of symmetry) through the centre of the lens perpendicular to the principal axis
- An incident ray drawn parallel to the principal axis will refract through the focus on the other side of the lens

Drawing Ray Diagrams

- Step 2
- Draw an incident ray through F1 that will refract through the lens parallel to the principal axis

Drawing Ray Diagrams

- Step 3
- An incident ray aimed at the centre of the lens will pass through the lens

Identify the characteristics of this image:

principalaxis

F

F1

closer

inverted

smaller

real

L: _____________ O: _____________ S: ____________ T: ________

Notes

- Complete the handouts:
- 4.6 Converging Lenses: Drawing Ray Diagrams
- 4.6 What are lenses and what are some of their applications? (Summary)

Vocabulary Journal

- Add this term and definition:
- lens

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