What is a lens?

  • A
    $A$ piece of glass
  • B
    An optical system with two refracting surfaces
  • C
    $A$ mirror with a curved surface
  • D
    $A$ device to reflect light

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Similar Questions

Which of the following always form a virtual image?

What changes; frequency or wavelength, when light passes from a rarer to a denser medium?

What type of image is formed by a plane mirror?

What does positive magnification mean?

$(a)$ Calculate the distance at which an object should be placed in front of a convex lens of focal length $10\, cm$ to obtain a virtual image of double its size.
$(b)$ In the above given case,find the magnification,if the image formed is real. Express it in terms of the relation between $v$ and $u$.

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