Which of the following relations hold good?

R = F

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

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

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2F = R

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Solution

The correct options are
C
F = $\frac{R}{2}$

D
2F = R

The focal point, $F$ occurs at the midpoint between pole and radius of curvature. So, if the radius of curvature is R, then focal length, F = $\frac{R}{2}$

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Which of the following relations hold good?

The correct options are C F = R2 D 2F = R The focal point,F occurs at the midpoint between pole and radius of curvature. So, if the radius of curvature is R, then focal length, F = R2

The correct options are
C
F = $\frac{R}{2}$

D
2F = R

The focal point, $F$ occurs at the midpoint between pole and radius of curvature. So, if the radius of curvature is R, then focal length, F = $\frac{R}{2}$