Introduction to Lenses

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Introduction to Lenses

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Introduction to Lenses. Definition of a lens. A lens is transparent piece of plastic or glass with at least one refractive surface. How do lens work. A lens works by refracting (bending) light rays as they pass through it so they change direction - PowerPoint PPT Presentation

Transcript of Introduction to Lenses

Page 1: Introduction to Lenses

Introduction to Lenses

Page 2: Introduction to Lenses

Definition of a lens

• A lens is transparent piece of plastic or glass with at least one refractive surface.

Page 3: Introduction to Lenses

How do lens work

• A lens works by refracting (bending) light rays as they pass through it so they change direction

• Lenses work by bending light at a glass-air boundary.  Although refraction occurs at the boundary, we will treat all lenses as bending the rays at the lens axis.

Page 4: Introduction to Lenses

Converging Lens

• The lens in the eye is a convex or converging lens.  This means that the lens makes rays of light come together, or converge.

Page 5: Introduction to Lenses

Converging Lens

• The rays parallel to the principal axis are converged onto the principal focus.  

• The focal length is the distance between the lens axis and the principal focus.

Page 6: Introduction to Lenses

Diverging Lens• The concave lens

cause rays traveling parallel to the principal axis to diverge, which is why it is called a diverging lens.

• The principal focus is virtual because the rays do not pass through it, but diverge as if they had come from it.


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