Which of the following relations hold good where F is the focal length and R is the radius of curvature.

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Solution

The focal point occurs at the midpoint between pole and radius of curvature. So, if
radius of curvature = R

F = $\frac{R}{2}$

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Which of the following relations hold good where F is the focal length and R is the radius of curvature.

The focal point occurs at the midpoint between pole and radius of curvature. So, if radius of curvature = R F = R2

The focal point occurs at the midpoint between pole and radius of curvature. So, if
radius of curvature = R

F = $\frac{R}{2}$