Question

Which of the following factors does not affect the focal length of a convex lens?

• A. Refractive index of the material of the lens
• B. Refractive index of the medium in which the lens is kept
• C. Object distance from the lens
• D. Radii of curvatures of the lens

Answer 1

The correct option is C Object distance from the lens

Object distance from the lens does not affect the focal length, which depends on :
$1.$ Refractive index of the material of the lens
$2.$ Refractive index of the medium in which the lens is kept
$3.$ Radii of curvatures of the lens

Why this question? By the question, we can understand the factors which affect the focal length of a lens.