<p>4.&nbsp; The so-called \"lensmakers equation\" is shown below.&nbsp; The foca

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<p>4.&nbsp; The so-called "lensmakers equation" is shown below.&nbsp; The focal length of the lens (in cm)&nbsp;is f.&nbsp; The constant&nbsp;n is the index of refraction of the glass, relative to the medium&nbsp;around it&nbsp;(which is just the listed value of n unless the lens is submerged in water, or some other liquid).&nbsp; R₁ and R₂ are the radii of curvature of the two sides of the lens.&nbsp; The value of R for a side is considered to be positive if&nbsp;that side is convex;&nbsp; otherwise, it is negative.&nbsp; If the lens is flat on one side, the value of R for that side is infinite, and the ratio (1/R) is equal to zero.&nbsp;</p>
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