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  • Focal length of a convex lens of refractive index 1.5 is 2 cm. Focal length of lens when immersed in a liquid of refractive index 1.25 will beOption: 1

Focal length of a convex lens of refractive index 1.5 is 2 cm. Focal length of lens when immersed in a liquid of refractive index 1.25 will be

Option: 1

5 cm


Option: 2

7.5 cm


Option: 3

10 cm


Option: 4

2.5 cm


Answers (1)

\mathrm{ \frac{f_p}{f_a}=\frac{\left(\mu_g-1\right)}{\left(\frac{\mu_g}{\mu_1}-1\right)} \Rightarrow f_1=\frac{5}{2} \times f_a \\ }

\mathrm{ \frac{5}{2} \times 2 \mathrm{~cm}=5 \mathrm{~cm} }.

Posted by

Kshitij

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