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Converging Lenses. Section 4.6 Lesson 13. Uses for lenses. 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

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Converging lenses

Converging Lenses

Section 4.6

Lesson 13



Lenses
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


Lenses1
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 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
Vision correction using lenses

Diverging lens – used to correct short-sightedness

Converging lens – used to correct farsightedness


Converging lens
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
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


For an object beyond 2F1

principalaxis

F

2F1

F1


Drawing ray diagrams1
Drawing Ray Diagrams

  • Step 2

    • Draw an incident ray through F1 that will refract through the lens parallel to the principal axis


principalaxis

F

F1


Drawing ray diagrams2
Drawing Ray Diagrams

  • Step 3

    • An incident ray aimed at the centre of the lens will pass through the lens


principalaxis

F

F1


Identify the characteristics of this image:

principalaxis

F

F1

closer

inverted

smaller

real

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


Notes
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
Vocabulary Journal

  • Add this term and definition:

    • lens


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