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Lenses - experiment plan

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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.

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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.
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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.

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