The relation between u, v and r is:

r = \frac{2 u v}{u + v}

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r = \frac{2}{u + v}

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r = \frac{2 (u + v)}{(u v)}

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None of these

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Solution

The correct option is A $r = \frac{2 u v}{u + v}$
We know,
$1 / f = 1 / u + 1 / v$
Or $2 / r = 1 / u + 1 / v$
Since radius of curvature is double the focal length. This leads to option A.

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The relation between u, v and r is:

The correct option is A r=2uvu+vWe know,1/f=1/u+1/vOr 2/r=1/u+1/vSince radius of curvature is double the focal length. This leads to option A.

The correct option is A $r = \frac{2 u v}{u + v}$
We know,
$1 / f = 1 / u + 1 / v$
Or $2 / r = 1 / u + 1 / v$
Since radius of curvature is double the focal length. This leads to option A.