4.1 – Verifying the Lens Equation (Leaving Cert Physics): Quizzes

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4.1 – Verifying the Lens Equation
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What is the lens equation?

1f=1u+1v\frac{1}{f} = \frac{1}{u} + \frac{1}{v}

In the lens equation, what does vv represent?

Image distance from lens to image

What condition must be met for a converging lens to form a real image on a screen?

Object distance must exceed focal length

Which equipment acts as the object in this experiment?

Illuminated cross-threads

How is the focal length initially estimated in Step 1?

Focus on distant object; measure lens to image

To how many significant figures should distance measurements be recorded?

Three significant figures

What is the minimum total number of measurements required in this experiment?

5 measurements

In the graphical analysis method, what should be plotted?

1u\frac{1}{u} against 1v\frac{1}{v}

What value do both axis intercepts equal on the 1u\frac{1}{u} vs 1v\frac{1}{v} graph?

1f\frac{1}{f}

What shape does the graph of 1u\frac{1}{u} against 1v\frac{1}{v} produce?

Straight line with negative slope

What type of error results from judging when the image is in sharpest focus?

Random error in measuring vv

What type of error occurs if distances are measured to the lens surface instead of its centre?

Systematic error in uu and vv

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