How tofindfocal length ofconcave mirror

As others pointed out, the lensmaker's formula describes how the object $p$ and image $q$ distance are related to this property of the lens. So you just measure $p$ and $q$, and find $f$ from

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How to calculate focal length ofconvexlens

The focal point is a property of the lens. It is where parallel light would converge (in practice, that is light that "appears to come from infinitely far away").

One can also use Bessel's method, moving the lens between the two positions where there is a focused image (enlarged or smaller): $$f = \frac{D^2 -d^2}{4D},$$ where $D$ is the distance between object and image and $d$ the distance between the two ens positions.

so my question is how this method is true since the image will not be formed at the focal point, instead it will be beyond the focal point,therefore the result of focal length obtained will be false, can anyone help me please?

(I took the liberty of rearranging the usual formulation $\frac{1}{f}=\frac{1}{p}+\frac{1}{q}$ so you obtain $f$ directly from your measured values).

Focal length ofmirror formula

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How to calculate focal length ofparabola

The lensmaker's equation, $\frac {1}{p} + \frac {1}{q} = \frac {1}{f}$ is all you need if you have p and q. Just solve it for $f$, which is the focal length (the distance from the lens to the focal point).

to determine the focal length of the lens practically, we change the position of the image until we obtain a clear image which will be at the yellow arrow (not at focal point).

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Place the object very far away from the lens, so that the object distance is as great as possible. The larger the object distance, the more insignificant is the difference between focal length and image distance.

Focal lengthcalculator from image

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Focal lengthformula for concavelens

What isfocal length of lens

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We call it the focal point - but most of the time it's not where the image is located. Once you understand you are dealing with a property of the lens, not of the imaging scenario, I think this will be clear.

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Clear definition and great examples of Contrast. Contrast means difference, especially when that difference is very noticeable.

in the image illustrated above, we obtain focused image at the (position of image, inverted yellow arrow) not at the focal point.

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Better is to use a source of light that resembles a point source, such as the tip of an optical fiber, and place this at the focal length of a second lens so that a collimated beam is produced. Use the lens you are testing to focus the collimated beam to a point. The distance from the lens to the focus is the focal distance.

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A diffraction grating is an optical element, which separates (disperses) polychromatic light into its constituent wavelengths (colors).