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Ray Optics And Optical Instruments

Spherical Mirror

  • Concave spherical mirror − A spherical mirror whose reflecting surface is towards the centre of the sphere is called concave spherical mirror.
  • Convex spherical mirror − A spherical mirror whose reflecting surface is away from the centre of the sphere is called convex spherical mirror.
  • Focal length − The distance between the pole and the principal focus of the mirror is called the focal length (f) of the mirror.
  • For both the spherical mirrors the f = R/2
  • Mirror formula for both the mirrors is
  • 1f=1u+1v=2R
  • For convex mirror:
  • Position of object Position of object
    At infinity At the Focus behind the mirror
    Between infinity and the pole Between the pole and the focus behind the mirror
  • For concave mirror:
  • Position of object Position of object
    At infinity C
    Beyond C Between F and C
    At C At C
    Between C and F Beyond C
    Beyond C At infinity
    Between P and F Behind the mirror

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