# Investigating the relationship between the image distance

August 7, 2017 September 1st, 2019 Free Essays Online for College Students

In this experiment I will be changing two factors which will be the object distance and the image distance.

The following factors that are going to be kept constant are:-

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1. The positioning of the image and light source – if this is changed; it could affect the results and may give anomoulous results. The light source must also point at the image and directly at the convex lens.

2. The convex lens – if the size of this convex lens is change; it could again affect the results and may give anomoulous results.

3. The light source – The intensity of the light source needs to be kept the same to prevent any anomoulous results.

4. The bulb watt – this would have to be kept constant, i.e. if I use double the watt of the bulb than my overall outcome of results is will doubled.

APPARATUS LIST

To perform this experiment I will need some apparatus. This will consist of:-

* 30cm ruler

* 1m ruler

* A Pencil

* Blank A4 piece of paper

* Connecting wires x2

* Convex Lens

* Light bulb

* Power meter

DIAGRAM

Below is a labelled diagram of how the experiment is going to be set-up:-

METHOD

This is the procedure that I will use to do the experiment:-

1. Set up apparatus as in shown in the diagram.

2. Turn on the power.

3. Measure the object distance

4. Measure the image distance where the reflection of the image is the smallest and sharp.

5. Measure the bulb filament in the reflection.

6. Record down the measurements.

7. Repeat each time, making sure to decrease the object distance.

==> OBTAINING EVIDENCE

RESULTS TABLE

Object Distance (cm)

Image Distance (cm)

Size of Object (cm)

Size of Image (cm)

80

11.1

0.5

0.1

70

11.2

0.5

0.1

60

11.5

0.5

0.15

50

12.8

0.5

0.2

40

13.1

0.5

0.25

30

14

0.5

0.3

25

15.5

0.5

0.4

20

18

0.5

0.5

15

23

0.5

0.9

14

23.4

0.5

1.3

GRAPH – LINE OF BEST FIT

==> ANALYSIS

This graph above illustrates that as the object distance is decreased as more light is exposed through the convex lens meaning an increase in image distance. I think the results were fairly accurate, because you can see a general trend and hardly an anomalous result. How because it was conducted by a human rather than machine it would be that it is less accurate than it could have been due to human errors. Because of this I will work out the percentage error for the equipment I used.

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