PhysicsChoose which of the following is the correct definition power of a convex lens.

Choose which of the following is the correct definition power of a convex lens.


  1. A
    Convex lens is a lens which is not a normal lens., f
  2. B
    Convex lens power is positive., 1/f
  3. C
    Convex lens make sharp image in the retina., m
  4. D
    Convex lens is a type of lens which has lower edges and is broader from the medium. And the unit is m. 

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    Solution:

    Concept: A lens's power determines how much light it can gather or, alternatively, how much and by what angle it diverges light. The power of a convex lens is positive whereas that of a concave lens is negative. Power is the lens's capacity to bend and produce a clear picture on the retina.
    Convex lens is a type of lens which helps to show a sharper image in human eyes and it is measured by magnification(m).
    The focal length of convex lenses is always + and we know the relation between focal and power is P=1/f and f is taken in metres and power is reciprocal hence it is measured as
    dioptre .
    Hence, the correct option is 4.
     
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