AP EAMCET · PHYSICS · Ray Optics
The focal length of a thin converging lens in air is 20 cm . When the lens is immersed in a liquid, it behaves like a concave lens of power 1 D . If the refractive index of the material of the lens is 1.5 , the refractive index of the liquid is
- A \(\frac{5}{3}\)
- B \(\frac{4}{3}\)
- C \(\frac{5}{4}\)
- D \(\frac{7}{4}\)
Answer & Solution
Correct Answer
(A) \(\frac{5}{3}\)
Step-by-step Solution
Detailed explanation
In air, \(\frac{1}{\mathrm{f}_1}=\left(\mu_2-1\right)\left(\frac{1}{\mathrm{R}_1}-\frac{1}{\mathrm{R}_2}\right)\ldots\) (i) In medium, \(P_2=-1 D \Rightarrow f_2=\frac{100}{P_2} \mathrm{~cm}=-100 \mathrm{~cm}\)…
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