Give the properties of a lens in achromatic combination

Give the properties of a lens in achromatic combination

Give the properties of a lens in achromatic combination

Achromatic lenses are corrected to bring two wavelengths (typically red and blue) into focus on the same plane.

The lenses in achromatic combination are

  • Are made of concave and convex lens.
  • The radii of curvature of concave and convex are numerically equal
  • The dispersion caused by the concave lens should be cancelled by that of convex lens.

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