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# To Determine the Focal Length of a Convex Lens.

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Introduction

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.

Middle

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.

Conclusion

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.

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# Related AS and A Level Microscopes & Lenses essays

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

4 star(s)

the screen can all be positioned at 90 degrees to the ruler. This ensures the equipment is aligned at all times along the principle axis. ==> I will take the required measurements by setting the distance u (which will begin at 250 mm (because that is a higher measurement than the rough focal length I will have found earlier,)

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2. ## 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.

1. ## Lenses experiment

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