Monday, 26 December 2016

Lens - Important Physics Questions For Kerala PSC Exam

  • Power of a lens increases as its focal length decreases.
  • Power is the reciprocal of focal length.
  • Lens is not used in pinhole camera.
  • The lens in human eye - convex lens.
  • Power of a lens is measured in Dioptre.
  • Convex lens is thicker at the centre and narrower at the edges.
  • Lens is not used in pinhole camera.
  • Image formed in convex lens - Real and inverted.
  • Concave lens is narrower at the centre and thicker at the edges.
  • Focal length and power of a concave lens is always negative.
  • Focal length and power of a convex lens is always positive.

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