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.
- Focal length
- Radius of curvature
- Aperture
- None of these
Hint:
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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