TS EAMCET · Physics · Ray Optics
A convex lens of glass \(\left(\mu_g=1.45\right)\) has a focal length \(f_a\) in air. The lens is immersed in a liquid of refractive index \(\left(\mu_l\right) 1.3\). The ratio of the \(f_1 / f_a\) is
- A 3.9
- B 0.23
- C 0.43
- D 0.39
Answer & Solution
Correct Answer
(A) 3.9
Step-by-step Solution
Detailed explanation
Focal length of lens when placed in air \[ F_{\text {air }}=\left(\mu_{\text {lens }}-1\right)\left(\frac{1}{R_1}-\frac{1}{R_2}\right) \] Focal length of lens when placed in water…
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