• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Lenses - experiment plan

Extracts from this document...

Introduction

Lenses

Introduction

Lenses are a transparent material shaped to refract light. Lenses are remarkable and have helped mankind develop in the so many years the world now uses for almost and visual activity from swimming goggles to open heart surgery lenses are used in some form.  But lenses are not all the same. There are two main types of lenses convex and concave. These two lenses are opposites of each other and produce different images.

Concave lenses are rarer to find in every day life. A concave lens is curved inwards it is shaped like two dishes placed back-to-back. Light passing through a concave lens diverges. Unlike convex lenses, which produce real images, concave lenses produce only virtual images. A virtual image is one from which light rays only appear to come from but in actual fact the do not. This appears as a smaller to produce image just in front of the actual object.  Concave lenses are generally prescribed for short-sighted, people. Concave lenses help the eyes to produce a sharp image on the retina instead of in front of it.

Convex lenses are more common in everyday life. The lens is very thick in the middle and thinner at the edges.

...read more.

Middle

Within the laboratory there are frequent breakages which can have damaging affects and can cause injury. That is why it is important to try and prevent breakages knowing what the effect of a breakage is and what to do about it. When these breakages occur they can be on minor scale or a disastrous scale. This depends whether the glass is shatters or breaks in to jagged pieces, most lab breakages are on a minor scale and can simply be swept up by using a brush. With hazardous breakages do not attempt to clear the breakage and find someone qualified to attend to the breakage.

Method

When the experiment was carried out the first thing that needed to be attended to was having all the correct equipment and materials at hand. The following equipment and materials were gathered:

  • Protractor- A semicircular instrument used for measuring and constructing angles.
  • Mirror- A surface that reflects light at the angle it hit the surface which creates a virtual image.
  • Convex lens- A lens which converges light.
  • Concave lens- A lens which diverges light.
  • Power pack- A power pack which controls the amount of energy that goes to the light box
  • Grates- To split the light in to equal and parallel rays.
  • Pencil- A rod of graphite cased in wood or metal used for drawing or writing which can be erased by an eraser.
  • A3 paper- paper twice the size of A4 paper used to draw and write on.
...read more.

Conclusion

I think that the method and the equipment and the materials for this experiment are great for maximum accuracy but they do not eliminate the chance for human error.

Over all out of the whole experiment I enjoyed the theory the most due to the fact that it enhanced me knowledge about preparing accurate chemical solutions and it showed me it just wasn’t a basic skill but a crucial skill which involved a high level of accuracy I also enjoyed conducting the experiment even though I encountered many errors I enjoyed finding a solution to them. I also think that this experiment has challenged me mentally in every academic way. It has also helped me to develop personal thinking strategies.

During this experiment I learnt quote a lot and enhanced my general knowledge of chemicals as a whole and I learnt practical skills of preparing chemical solutions which I will be able to use in the future.

Over all this experiment has been an interesting and an enlightening experience which I have gained many skills and much knowledge even though I had encountered many problems I enjoyed the experiment thoroughly and would gladly repeat it.

...read more.

This student written piece of work is one of many that can be found in our AS and A Level Microscopes & Lenses 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

See related essaysSee related essays

Related AS and A Level Microscopes & Lenses essays

  1. In this experiment I will be investigating the efficiency of a motor. I hope ...

    The biggest error in the experiment as I have previously discussed was time, so it was unlikely that any one could have had results that were perfect. Other errors in my experiment were caused by practical faults, or by a more technical reason.

  2. My experiments focus is to obtain an accurate measurement for a specific lenss power.

    Summary: I would summarise that my results are satisfactorily accurate and reliable considering it is the first experiment. There are definitely improvements to be made, such as the high uncertainties in the higher 1/V values. My experiment had an element of zero error which is a type systematic error.

  1. Lenses experiment

    These are descriptions of the two lenses and how they work, this will hopefully explain why I am using a convex lens and why I am not taking any measurements between the focal point and the lens, if not this is because it gives a virtual image and a virtual image cannot be measured.

  2. Investigating the Positioning of Real Images formed by a Convex Lens.

    When you press the button, a shutter in front of the film opens and shuts again. This exposes the film to light for a brief moment only. Different intensities and colours of light across the image cause varying chemical changes in the film.

  1. Proving the lens formula.

    Method Before I begin the real experiment, I have chosen to perform a preliminary experiment to discover a suitable range of distances I will get results from. I will also have an idea of the power of the lens, so I can judge it's minimum and maximum distances to get a clear image on the sheet.

  2. Relationship Between U and V For a Convex Lens

    However the second diagram, the object has been moved nearer the convex lens which means u has decreased. The ray diagram illustrates that the v distance has increased. This proves that as u increases, the v distance decreases. The third diagram shows that when the object is placed nearer the

  1. Given a Tube Containing a Lens, Calculate The Focal Length of The Lens and ...

    = fm + [f - c] c = fm + [f - a] When this is put into a graph where the y-axis is c and the x-axis is m, using the standard formula for the equation of a graph, y = mx + c where m = gradient and

  2. Does the focal length of a lens depend on the colour of light used?

    Collect the apparatus listed earlier 2) Set up the diagram up as shown. 3) Insert the red filter into the ray box 4) For each different object distance move the screen until the image is in focus. 5) Repeat this twice for each object distance listed earlier then carry out

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