<< Back to Lessons Index

Science_Lab_Yellow / Lesson 10: Review

How Do Lenses Work

What will we be learning today?

  • In this lesson, we are going to learn all about how lenses work.

  • Light Ray- a straight-line beam of light as it travels outward form its source

    Law of Reflections - the angle between an incoming light ray and a surface equals the angle between the reflected light ray and the surface

    Image - a "picture" of the light source that light rays make in bouncing off a polished, shiny surface Concave Mirrors - a mirror that curves in on the shiny side

    Convex Mirrors - a mirror that curves out on the shiny side

    Opaque - completely blocking light from passing through it


    Transparent - letting all light through, so that objects on the other side can be seen clearly

    Translucent - letting only some light through, so that objects on the other side appear blurry

    Polarization - allowing light vibrations to pass through in only one direction

    Refraction - the bending of light rays as they pass from one substance into another

    Convex Lens - a lens that is thicker at the middle than at the edges. As it curves outward, it brings light together making images appear larger


    Concave Lens - a lens that is thicker at the edges that at the middle. As it curves inward, it spreads light rays apart, making images appear smaller

    Retina - sheet of tissue in your eye that converts the light into signals that nerves carry to the brain


  • Make sure you study your notes

  • Now go take the Unit 5 Exam on the computer