Converging Lenses Section 4.6 Lesson 13.

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Presentation transcript:

Converging Lenses Section 4.6 Lesson 13

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 We also use lenses for glasses! https://www.youtube.com/watch?v=OydqR_7_DjI&list=TLHeswydtZnOv1sa2TF6611HZItZiCuDBN

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

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

principal axis F1 F

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 principal axis 2F1 F F1

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

principal axis F1 F

Drawing Ray Diagrams Step 3 An incident ray aimed at the centre of the lens will pass through the lens

principal axis F1 F

Identify the characteristics of this image: principal axis F1 F 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