1. Tardigrade
  2. Question
  3. Physics
  4. An object is put at a distance of 5 cm from the first focus of a convex lens of focal length 10 cm. If a real image is formed, its distance from the lens will be

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. An object is put at a distance of $5 \,cm$ from the first focus of a convex lens of focal length $10\, cm$. If a real image is formed, its distance from the lens will be

Ray Optics and Optical Instruments

Solution:

$\frac{1}{v}-\frac{1}{u}=-\frac{1}{f}$
$\frac{1}{v}-\frac{1}{-15}=\frac{1}{f}$
or $\frac{1}{v}-\frac{1}{15}+\frac{1}{10}$
or $\frac{1}{v}=\frac{-2+3}{30}$
or $ v=30 \,cm$