Physics 5054/32 — October/November 2016

Cambridge O-Level · Practical Test · worked solutions for every part, with the mark scheme

questions

marks

120

minutes

Topics Observations and Measurements · Analysis, Conclusions and Evaluation · Experimental Contexts · Use of Techniques, Apparatus and Materials · Planning Experiments and Investigations

Q1Observations and MeasurementsUse of Techniques, Apparatus and MaterialsAnalysis, Conclusions and EvaluationFree sample

In this experiment, you will determine a value for the focal length of a lens.

You are provided with

a converging lens,
a small piece of Blu-Tack,
a 30 cm ruler,
two set squares.

(a)

The Supervisor has provided you with either a lens A, that has two curved surfaces, or a lens B, that has one flat and one curved surface. Both lenses are shown in Fig. 1.1.

Fig. 1.1

Measure the thickness $t$ of the lens at its edge. For some lenses $t$ is very small. Give your answer to the nearest 0.5 mm.

$t$ = ______

(b)

Place the lens on the ruler with a diameter of the lens along the edge of the ruler, as shown in Fig. 1.2.

Fig. 1.2

(i)

Take measurements to determine an average value for the diameter $D$ of the lens.

$D$ = ______

(ii)

Describe, with the aid of a diagram in the space below, how you made sure that an accurate value was obtained for $D$ .

(c)

Using a small piece of Blu-Tack, stand the lens vertically on the ruler as shown in Fig. 1.3.

Fig. 1.3

(i)

On Fig. 1.3 draw a diagram to show how to determine the thickness $T$ of your lens at its centre using two set squares.

(ii)

Determine $T$ .

$T$ = ______

(d)

Calculate the focal length $f$ of the lens using

f = \frac{D^2}{4.2(T - t)}

$f$ = ______

The rest of this paper

3 more questions

Q2Experimental Contexts · Observations and Measurements5M
Q3Observations and Measurements · Experimental Contexts · Analysis, Conclusions and Evaluation5M
Q4Observations and Measurements · Experimental Contexts · Use of Techniques, Apparatus and Materials · Planning Experiments and Investigations · Analysis, Conclusions and Evaluation15M

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