MHT CET · Physics · Ray Optics
A convex lens is dipped in a liquid whose refractive index is equal to refractive index of lens material. Then its focal length will
- A increase
- B remain unchanged
- C become infinite
- D become zero
Answer & Solution
Correct Answer
(C) become infinite
Step-by-step Solution
Detailed explanation
For a lens \(\frac{1}{\mathrm{f}}=\left(\mu^{\prime}-1\right)\left(\frac{1}{\mathrm{R}_1}-\frac{1}{\mathrm{R}_2}\right)\)
Where \(\mu^{\prime}=\frac{\mu_{\mathrm{g}}}{\mu_{\ell}}=1\)
\(
\therefore \frac{1}{\mathrm{f}}=0 \text { or } \mathrm{f}=\infty
\)
Where \(\mu^{\prime}=\frac{\mu_{\mathrm{g}}}{\mu_{\ell}}=1\)
\(
\therefore \frac{1}{\mathrm{f}}=0 \text { or } \mathrm{f}=\infty
\)
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