Physics
Grade-10
Easy

Question

A spherical lens is said to be thin lens when its ______ is negligible as compared to its radius of curvature.

  1. Focal length
  2. Radius of curvature
  3. Aperture
  4. None of these

hintHint:

The lens is considered to be thin when it is with a negligible thickness of the aperture as compared to the radii of curvature of the lens surfaces.

The correct answer is: Aperture


    A spherical lens is said to be thin lens when its aperture is negligible as compared to its radius of curvature.
    • The part of the lens through which the light rays passes is called the aperture.
    • The radius of the lens is the distance between the center of the sphere and the optical center.
    • Thus, when the thickness of the aperture becomes less than the radius, the lens is considered to be thin.
    • Which means the radius of curvature is same as that of its aperture. (Aperture = Radius of curvature)

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