1. Tardigrade
  2. Question
  3. Physics
  4. A thin Plano-convex glass lens (.μ = 1.5.) has its plane surface silvered and R is the radius of curvature of curved part, then which of the following ray diagram is true for an object placed at O ? ( O is at a distance of 2R from the lens)

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. A thin Plano-convex glass lens $\left(\right.\mu = \, 1.5\left.\right)$ has its plane surface silvered and $R$ is the radius of curvature of curved part, then which of the following ray diagram is true for an object placed at $O$ ?

( $O$ is at a distance of $2R$ from the lens)

NTA AbhyasNTA Abhyas 2020Ray Optics and Optical Instruments

Solution:

For Refraction at first surface $\frac{1.5}{v}-\frac{1}{u}=\frac{1.5 - 1}{R}$
$u=-2R, \, $
$v=\infty$
Therefore, rays strike the mirror normally. So, by principle of reversibility, $\text{O }$ and $\text{ I}$ coincide.