TS EAMCET · Physics · Ray Optics
Three thin lenses are combined by placing them in contact with each other to get more magnification in an optical instrument. Each lens has a focal length of \(3 \mathrm{~cm}\). If the least distance of distinct vision is taken as \(25 \mathrm{~cm}\), the total magnification of the lens combination in normal adjustment is
- A 9
- B 26
- C 300
- D 3
Answer & Solution
Correct Answer
(B) 26
Step-by-step Solution
Detailed explanation
Combined focal length \(\left(\frac{1}{F}\right)=\frac{1}{F_1}+\frac{1}{F_2}+\frac{1}{F_3}\) \[ \begin{aligned} & \Rightarrow \quad \frac{1}{F}=\frac{1}{3}+\frac{1}{3}+\frac{1}{3} \\ & \Rightarrow \quad F=1 \mathrm{~cm} \\ & \end{aligned} \] Magnification of the lens combination…
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