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Limit of Resolution

How is focal ...

Question

How is focal length related to refractive index?

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Solution

$μ_{1} μ_{2} μ_{1}$
The relation is
$\frac{1}{f} = (\frac{μ_{2}}{μ_{1}} - 1) (\frac{1}{R} - \frac{1}{R_{2}}) o f 2^{n d} s u r f a c e$
Radius of curvature of $1^{s t}$ surface.

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