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Question: Answered & Verified by Expert
A plano convex lens of material of refractive index $\mu_1$ exactly fits into a plano concave lens of material of refractive index $\mu_2$. If $R$ is the radius of curvature of the curved surfaces of the lenses and the plane surfaces of the lenses are parallel, the focal length of the combination is
PhysicsRay OpticsAP EAMCETAP EAMCET 2017 (26 Apr Shift 2)
Options:
  • A $\begin{aligned} & \mathrm{R}\left(\mu_1-\mu_2\right) \end{aligned}$
  • B $\begin{aligned} & \frac{\mathrm{R}}{\mu_1-\mu_2}\end{aligned}$
  • C $\begin{aligned} & \frac{\mu_1-\mu_2}{R}\end{aligned}$
  • D $\begin{aligned} & \frac{1}{R\left(\mu_1-\mu_2\right)}\end{aligned}$
Solution:
1693 Upvotes Verified Answer
The correct answer is: $\begin{aligned} & \frac{\mathrm{R}}{\mu_1-\mu_2}\end{aligned}$
No solution. Refer to answer key.

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