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  2. Learn about and revise lenses, images, magnification and absorption, refraction and transmission of light with GCSE Bitesize Physics.

    • What Are lenses?
    • How Do Lenses Work?
    • How Do You Measure The Power of A lens?
    • How Are Lenses Made?

    A lens is a transparent piece of glass or plasticwith at least one curvedsurface. It gets its name from the Latin word for "lentil"(a type of pulse used in cooking), but don't let that confuse you.There's no real reason for this other than that the most common kindof lens (called a convex lens) looks very much like a lentil! Photo: Lentils gave len...

    A lens works by refraction: it bends light rays as they pass throughit so they change direction. (You can read a full explanation of whythis happens in our article on light.)That means the rays seem to comefrom a point that's closer or further away from where they actuallyoriginate—and that's what makes objects seen through a lens seemeither bigger...

    If you've ever looked through binoculars,a telescope, or a magnifyingglass, you'll know that somelenses magnify (or reduce) the apparent size of an object much morethan others. There's a simple measurement that tells you how powerfula lens is and it's known as the focal length. Thefocal length of a lens is the distance from the center of the lens t...

    Photo: This magnifying glass uses a single convex lens made from plastic. Until plastics became common in the20th century, virtually all lenses were made bygrinding solid pieces of glass into differentshapes. Convex lenses were made by using a concave-shaped grinding tool (and vice-versa),and then the roughly shaped lens was polished to make its fi...

  3. A lens is a piece of transparent material which concentrates or disperses light rays when passes through them by refraction. According to the shape and purpose of the lens, they are classified into two types convex lens and concave lens. Let’s learn about convex lenses in detail in this article.

    • 52 min
    • 18.9K
  4. Convex lenses can produce an inverted image on a screen by refracting light. Rays parallel to the principal axis are refracted to the principal focus, located at the focal length of a convex lens. The image distance and size (magnification) depend on the power of the lens and the object distance.

  5. A convex lens is a converging lens. When parallel rays of light pass through a convex lens the refracted rays converge at one point called the principal focus. The distance between the principal focus and the centre of the lens is called the focal length.

  6. Convex and concave lenses can both be used to correct defects of vision. The most commonly occurring defects of vision are ‘short sightedness’ and ‘long sightedness’.

  7. Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/science/physics/geometric-optics/le...

    • 9 min
    • 444K
    • Khan Academy
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