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Introduction to Lenses

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

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Introduction to Lenses

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  1. Introduction to Lenses

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

  3. How do lens work • A lens works by refracting (bending) light rays as they pass through it so they change direction • Lenses work by bendinglight at a glass-air boundary.  Although refraction occurs at the boundary, we will treat all lenses as bending the rays at the lens axis.

  4. 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.

  5. Converging Lens • The rays parallel to the principal axis are converged onto the principal focus. • The focal length is the distance between the lens axisand the principal focus.

  6. 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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