• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month
Page
1. 1
1
2. 2
2
3. 3
3
4. 4
4
5. 5
5
6. 6
6
• Level: GCSE
• Subject: Maths
• Word count: 1358

# An Investigation to see how the size of ashadow depends on the angle at which the light hits the object

Extracts from this document...

Introduction

An Investigation to see how the size of a shadow depends on the angle at which the light hits the object

## Introduction

The aim of the project is to see which factors affect the size of a shadow and then to look more closely at one of the factors to see how exactly it varies the size of a shadow.

## Variables that may affect the size of the shadow

Although, I will investigate how one factor affects the size of a shadow, there are other factors that could be investigated. Here are some examples:

1. The distance between the light and the object

From the ray diagrams I can see that as the distance from the object to the light source is doubled, the length of the shadow decreases. A distance of 4cm produces a shadow of approximately 1.6-cm. Decreasing the distance to 2cm(half the distance), the shadow size increases by one and a half times to produce a shadow of 2.3 cm. The three ray diagrams together show the increase of the distance between the object and light source, decreasing the length of the shadow.

2) The distance between the object and the screen

The results from this are opposite varying the previous factor.

Middle

5) The angle at which the screen is

This shows that by increasing the angle the screen is held at, increases the length of the shadow. As I have not measured the angles I cannot compare the increase of angle to the length of shadow in numerical form, but this could be further investigated.

6) The size of the object

This is an obvious effect but it still is a factor as it affects the size of the shadow in a directly proportional way i.e.: the bigger the object, the larger the size of shadow.

7) The angle at which light hits the object

This shows by increasing or decreasing the angle the length of the shadow increases. By increasing the angle to 20º the length of shadow changes from 1.9cm to 2.6 i.e.: it increases by 1.3 times.

I have decided to investigate how varying the angle at which light hits the object affects the size of a shadow. It is important that all the other factors are kept constant in all my experiments; otherwise I would not be finding the effect of the factors, but of a mixture of factors. Therefore these factors will be kept constant.

• The distance between the light and the object: I will keep this constant by moving the light in a semi-circle, where the distance between the light and the object will stay the same.
• The distance between the object and screen: The screen and the object will not be moved throughout all the experiments.
• The light source
• The shape of the object: The same object will be used each time.
• The angle at which the screen is: The screen will be clamped 90º to the ground and will not he altered.
• The size of the object: The same object will be used each time.

Conclusion

From this I realised that

• A 12V torch bulb would suit me better as the bright light created a darker shadow than the 5V bulb, which was very dim. A darker shadow was more vivid than the fainter shadow, therefore easier to take measurements from.
• Moving the object and changing it with other objects made me realise that a 2D shade didn’t stay upright very well. I decided not to opt for the scissors because as it was difficult to measure the size of the shadow.In the end I chose a 3D rectangular block.
• Standing the block upright was a better than leaving it lying on its wider base as it was hard to see the edges of the shadow, when it was lying flat.

## Strategy

Apparatus list:

• A large screen
• A 12V torch bulb and a power supply
• A rectangular block
• A sheet with a large protractor drawn on it indicating the angles I will place the light at

I need to change the angle by 15º each time i.e.: 15º further away from the starting line each time. I will measure the length and width of the shadow in order to work out the areas. The ruler will be marked with cm’s and mm’s. I will measure to the nearest   .

This student written piece of work is one of many that can be found in our GCSE Comparing length of words in newspapers section.

## Found what you're looking for?

• Start learning 29% faster today
• 150,000+ documents available
• Just £6.99 a month

Not the one? Search for your essay title...
• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month

# Related GCSE Comparing length of words in newspapers essays

1. ## Features explaining the effectiveness of the spoken sermon and features demonstrating subtleties of communication ...

The definite article "the" is most often uttered with the short vowel as /??/ but here is found lengthened into /??:/, which elongates and thereby emphasises the word. This is most likely to indicate that a key word will follow; the noun to which the determiner applies is "passage", and

2. ## The aim of the experiment was to see if people's attention is affected by ...

interesting to compare people's I.Q to how long it would take them to read conflicting words, and then compare these two variables to see if intelligence might affect this process. Instead of an opportunity sample, I could use a stratified sample to find out about this.

1. ## My aim is to investigate if the distance of an object from a light ...

We found that this didn't give us a clear shadow again, which is important for gaining accurate measurements. We did preliminary tests to ensure that all our equipment was in good condition and all working. Method After setting up our equipment we set the bulb at the height of 30cm.

2. ## How well can you estimate the length of an object?

The year with the most guesses will be more accurate. This is how I have achieved my first random sample:- * Shift Ran# = 0.884 * 0.884 x 173 = 152.932 * round the number off to 153. therefore that is my first sample.

1. ## Data Handling Project

Should numbers be counted as words? 5 They should not be counted as they are do not reflect the newspaper, however numbers written in text (Five) will be counted. That explains the problems I may face while collecting data, and how to deal with them.

2. ## This investigation looked to see whether the height on the shore would affect the ...

to be able to exist without being under water for longer times than they would be in the lower shore. Gibbula umbilicalis is a a topshell snail, they are found across the shore, upper to lower. It would be expected that there is a difference between the Gibbula umbilicalis in

1. ## In this investigation I aim to carry out a modification on the experiment on ...

So, even though the participants didn't often read the colour word out loud, there was a time delay whilst the participants thought of the correct response (the colour ink). AIM: In this investigation I aim to carry out a modification on the experiment on automatic processes carried out by Stroop and to discover whether the results correspond.

2. ## In this investigation I am going to compare and analyse three newspapers to see ...

The median is the middle value of my data when it is in ascending order. The advantage of using the mean other than other averages is that it is not affected by extreme values and gives a general feel for the data.

• Over 160,000 pieces
of student written work
• Annotated by
experienced teachers
• Ideas and feedback to