search
arrow-left Previous
Next arrow-right
Q: A boy focuses a sharp image of a distant object on a screen using a lens. The distance between the lens and screen is approximately equal to:
  • A. 2f
  • B. f/2
  • C. f/3
  • D. f
Correct Answer: Option D - From any distant object light rays makes a parallel path before falling upon the lens, therefore when these parallel rays get refracted from the lens, they converge at the principal focus (f) of the lens.
D. From any distant object light rays makes a parallel path before falling upon the lens, therefore when these parallel rays get refracted from the lens, they converge at the principal focus (f) of the lens.

Explanations:

From any distant object light rays makes a parallel path before falling upon the lens, therefore when these parallel rays get refracted from the lens, they converge at the principal focus (f) of the lens.