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

To investigate the relationship between u and v for a convex lens.

Extracts from this document...

Introduction

To investigate the relationship between u and v for a convex lens. Prediction I predict that the values of u two times greater than the focal length of the lens, the image will be diminished and the value for v will be greater than the focal length of the lens but not greater than two times the focal length of the lens. The bigger u the smaller the image and closer to the focal length v is. A simple ray diagram can prove this: I also predict that the values of v less than two times the focal length but greater than the focal length the image will be magnified and the value for v will be greater than twice the focal length. The closer to the focal length v is the more magnified the image and the bigger the value of v. This can be proved by this diagram: I also predict that for the values of u less than f a virtual image will be produced as this does not connect u and v there is no point using values of u less than the focal length. Ideal Results My Ideal results are on a separate page and were calculated using the formula 1/u+1/v=1/f u= the distance of ...read more.

Middle

This is because the image for the smaller values is much larger and the value of v has a greater gap between each step than the higher values of u. Diagram Apparatus * 12 volt lamp- to produce the light must be right next to the object so the maximum light gets through * Object- a cross hair shape so it is easily identified and a clear image can be obtained each time * Convex lens * White Screen- so image can be clearly seen and observed * Metre rule- to measure u and v Method First collect apparatus noted above. Set up apparatus as shown in the diagram making sure the object and the 12-volt lamp are very close together so the maximum light gets through. The lamp must have gone through a 12-volt power supply. For each value of u make sure the object is u centimetres from the centre of the lens using a metre rule to the nearest millimetre. Once this has been done use a vertical plain white screen to focus the image on. If there is a range of distance where there is an image keep moving the screen until the clearest possible image is present on the screen. ...read more.

Conclusion

This could mean that the full amount of light is not going through the object therefore changing the distance of v. This problem can be solved by focusing the light so that it only goes through the object therefore increasing the light intensity. A second problem with the experiment is that the object is made of glass and this diverges the rays slightly so when the light reaches the lens not all the light then gets focused therefore changing the length of v. The way of remedying this problem would be to make the object out of a transparent material that would not bend the light. Or focus the light towards the centre of the object so the amount of light that is diverged is cut down. Further tests that could be done are the differences in different types of objects using different materials. Also seeing if the dimming the lights has on the experiment to see if the light intensity makes any difference to the results. The evidence of my results is not quite accurate enough to support my conclusion in full. However this not due to the experiment this is more down to human error. Also interpretation of where the image is at its clearest varies from person to person therefore making my results slightly inaccurate. ...read more.

The above preview is unformatted text

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. Peer reviewed

    Physics coursework; Finding the focal length of a lens using a graphical method.

    4 star(s)

    is appropriate level off sensitivity; any more sensitivity would be unsuitable for the apparatus being used and since I can quite easily judge to 2mm, any less would be too insensitive. ==> This experiment will be carried out in dark conditions to make the bright image easier to see, thereby increasing the accuracy of the experiment.

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

    travels at the same speed as the red light so the blue light must have a greater frequency. Because the blue light has a greater frequency it travels a greater distance inside the lens and this means the lens to bends the light more because the blue light is affected

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

    This can then be projected on to a screen, this is a real image. To get the clearest image the object distance (u), and image distance (v), must be exactly proportional to the focal length (f), (Previous diagram). The equation connecting the distance of an object from the lens and

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

    However the imaging problem opposed this improvement and lead to a higher uncertainty in the final measurement. Also the fact its largest uncertainty (0.0914) is larger than the filament lamp's largest (0.0873) insinuates that it is generally less reliable for measurements.

  1. An investigation into the workings of the opticians

    A laser can also be used to 'shave off' cells from the surface of the cornea thus changing its shape and correcting the sufferers vision. Or if the sufferer does not want to take the risks involved in these operations then a lens with two different corrective plains is used to accommodate for the abnormal shape of the cornea.

  2. Lenses experiment

    Ray diagram 5 shows a real, diminished and inverted image, as I thought. Now if I work out the magnification for each of the diagrams they should gradually decrease. There are two ways of working out the magnification one simple way and one more complicated way, which is supposed to be more accurate.

  1. The focal length of a convex lens.

    In Fig. e, Q is the image position of P when the lens is either at position 1 or 2. The difference in both cases is only in the image size. In this experiment, you will capture a sharp image at Q when the lens in located at position 1.

  2. Finding the Focal Length of a Lens.

    This means that the focal length cannot be pinpointed. Instead, we get a mean for the focal length with some uncertainty/deviation. * Because the light was in a shape of a circle, it was hard to distinguish a point where the dot was focused.

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