# Does the focal length of the lens depend on surrounding medium?â€‹

$\frac{1}{f}=\left(\frac{M_{2}}{M_{1}}-1\right)\left(\frac{1}{R_{1}}-\frac{1}{R_{2}}\right)$

where R1â€‹,R2â€‹ are radius of curvature of two sides of lens. And M2â€‹ is refractive index of material of which lens is made of and M1â€‹is refractive index of surrounding medium. And by this formula we see that focal length is also dependent on the material of lens.

From here we can say that the focal length also depends on the material of the surrounding

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