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G-11 Phys Ch-8

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  • II; = + 2 OO; , magnification is ____. Is the image is erect or inverted?
    + 2 / erect
  • A convex lens is ______ lens.
    converging
  • A ______ image cannot be formed on a screen.
    virtual
  • The magnification of a real image has ______ sign because it is inverted.
    minus or negative
  • In concave lens , only the ______ image formed.
    virtual
  • When an object is between F and 2F , the image is formed in _______.
    beyond 2F
  • Can the concave lens be used as a magnifying glass?
    No
  • P= - 25 D , Which types of lens is used?
    concave lens
  • Lens equation is
    1/u + 1/v = 1/f
  • Both real and virtual image formed by a _____ lens.
    convex
  • The unit of power of a lens is _____.
    dioptre (D)
  • The distance between F and P is
    focal length
  • A ______ lens diverge the rays of light.
    concave
  • The power of a lens is inversely proportional to its _____.
    focal length
  • The distance between the centre of lens and object is _______.
    object distance
  • Lens-maker's equation is
    1/f = (n-1) (1/R1 + 1/R2)
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