A ray of light enters a spherical lens. The effective focal length of the lens is determined by each of these EXCEPT
A) the curvature of the lens.
B) the distance from the center line at which the ray enters the lens.
C) the placement of the eyepiece.
D) the wavelength of the light.

Question

Quizplus · Accepted Answer

The effective focal length of a lens is primarily determined by its physical properties such as curvature (A), the material's refractive index which relates to the wavelength of light (D), and to some extent, the point of entry of the light ray (B). The placement of the eyepiece (C) does not directly affect the lens's focal length; instead, it relates to how the image is viewed or projected after being focused by the lens.

A Ray of Light Enters a Spherical Lens