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

To Determine the Focal Length of a Convex Lens.

Extracts from this document...


To Determine the Focal Length of a Convex Lens. Aim: To determine the relationship between the power of the vocal lens, object and the image distance from the lens. Apparatus: Bulb Projector Convex lens Lens holder Screen Optical Bench 12V power supply Diagram: Method: * Set up the apparatus as shown in diagram. * Put the focal lens at the first distance shown on the results. Also put the object at the 0 point of the optical bench. * Switch the 12V bulb and move the projector until a clear picture of the object is visible. * Record the results on the results table of the distance from the lens to the projector * Keep on moving the object to the 6 points shown on ...read more.


as well as measuring the distance from the lens to the projector (V) will make me think of a formula. I have obtained a formula for this: - 1 + 1 = 1 or 1 = -1 + P U V F U V AND Problems that might arise: In this experaments there might be a number of problems. For example the equipment might not be 100% accurate; this might effect my results, so I will do the experiment two or three times to ensure the results are accurate. I will keep the bulb brightness the same all through out the experiment. I will also keep the projector in the same place, which is at zero on the optical bench. ...read more.


I can see this from my results and I also saw that the closer the lens to the object the smaller the object on the screen. I also have found out that if the object is to close to the lens the object can not be focused on to the screen, this is called virtual imaging (see below diagram). I have not got any trends or odd results and I think that the experiment went as I had planed, except the results table I done was not going up in 5mm but was going up in 10mm which made the results not as accurate. There were no other problems. I think that the experiment could not have gone any better then I planed. Asif Ishaq ...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)

    bright, especially since the experiment was conducted in a room with extraneous light sources, also, although I took measures (blu-tack,) to ensure the lens remained in constant position throughout, it is possible that it was not at a 90 degree angle to the ruler.

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

    sure it is secure * Set the lens stand in front of the ray box * Setup the screen in front of the lens stand * Calculate the focal length of the lens, by using parallel light from a window * Blue - Tack the lens into the lens stand

  1. To investigate the relationship between the distance between a lens and an object, and ...

    Hypothesis: The larger the distance between the lens and the object, the smaller the distance between the lens and a projected, focused and real image onto a screen. This is because, as shown in my measured ray diagrams (entitled "Prediction"), the focal point is shown to be farther away when the object is closer.

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

    The range is wide, easy to deal with and easy to measure the difference. Conclusion I conclude with the evidence collected in the preliminary investigations and with the evidence shown in my ideal results that the best lens to use for this experiment will be the lens with a focal lens of 15 centimetres.

  1. Finding the Focal Length of a Lens.

    were in focus. (See third bullet point) After doing the pre-test, the problems encountered can be rectified in the experiment proper. Now all that is left is to make some measurements of u and v when the image on the screen is focused, put them into the lens equation and see whether or not the focal length is 20 cm.

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

    As previously mentioned, I will attempt to combat errors by ensuring my source of light is aligned with the rulers' 0mm reading for each result, and that I operate in a darker environment so it is easier to distinguish the range of focus for images.

  1. Lenses experiment

    Preliminary work Apparatus In the preliminary work I have to find out which lens I will be using and why I have chosen to use that particular one. I will want the one with the most easily manageable focal distance.

  2. Find the focal length of a given convex lens.

    The total distance d = 2u + l. So according to the formula, So, y = l 2/d, x = d and m = 1 as, c = - 4f So f can be found by dividing the y - intercept by 4.

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