In Ramsden eye-piece the focal length of each lens is (F) .... | Physics | SolveeIt | Solveeit

Today, August 18

Question

In Ramsden eye-piece the focal length of each lens is $F$ . The distance of the image formed by the objective lens from the eye lens is

A

$\frac{14F}{15}$

B

$\frac{13F}{14}$

C

$\frac{12F}{13}$

D

$\frac{11F}{12}$

Answer

$\frac{11F}{12}$

Explanation

Solution

The distance of image fanned by the objective lens from the eye lens $=\frac{2F}{3}+ \frac{F}{4}=\frac{8F\, +\, 3F}{12}=\frac{11F}{12}$