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

Observe how a microscope can be focused on different levels of an object from its top to its bottom surface.

Extracts from this document...

Introduction

Liban Ahmed                                   Experiment 3                           September 20, 2003

Depth of Field

Purpose

Observe how a microscope can be focused on different levels of an object from its top to its bottom surface.

Hypothesis

The microscope can be adjusted and utilized to focus on objects that have different depths. The microscope has different depths of fields depending of the magnification. The higher the magnification the less depth of field. The lower the magnification, the higher the depth of field.

Materials

  • Prepared slide of 1cm square pieces of several types of cloth
  • Microscope

Procedure

  1. Brought a microscope to the lab area making sure to use both hands to carry the microscope and that the cord was not dangling.
...read more.

Middle

Rotated the nosepiece to the low-power objective lens and carefully focused on the image. Recorded observations.Rotated the nosepiece to the medium-power objective lens and carefully focused on the image.Recorded observations.Rotated the nosepiece to the high-power objective lens and carefully focused on the image.Recorded observations.Removed the slide.Cleaned up the lab area and placed the equipment in the designated places.

Observations

Observations of the Slide under the Low, Medium, and High Magnifications

  1. Under the low-power magnification, the red thread seemed to be on the top position. Three threads seemed to be in focus under the low-power magnification and all three threads were simultaneously in focus.
  1. Under the medium-power magnification, the red thread seemed to be on the top position.
...read more.

Conclusion

Text Questions

  1. The eye focuses on one object at a distance; however, it has to adjust and focus if the individual looks at a closer or more distant object. Therefore, the eye is continuously adjusting to focus on close and distant objects. An individual cannot focus on a near and distant object at once.
  1. An object being observed under a microscope must be thin to allow light from the diaphragm to pass through the object thus allowing the object to be magnified. An object must also be thin to allow the observation of detail and texture. If no light passes through the object, the object will leave a dark shadow and there will not be a presence of detail or texture.  

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

    I think that these are fairly accurate results as they all show similar trends and each run-through has produced similar results. I will now plot four graphs using the data obtained. Conclusion: I can see from these graphs that the u and v are inversely proportional.

  2. Lenses experiment

    the only thing as part of the experiment that I will be changing. Method To find out which lens I want to use I will have to find out the focal lengths of them, because I want the one with the most easy to work with and of a reasonable size.

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

    Also I must use the same diameter and focal length lens; lenses with different focal lengths will of course have different powers. First Experiment * Power pack set to 9 Volts * Using a filament lamp as light source * Distance the U value decreases per stage is 50mm U (x10-3 M)

  2. A brief history of how the light microscope has developed since the 17th Century ...

    In this type of a microscope, a high vacuum is required in which electrons can be speeded up so that their wavelength is extremely short, which creates an electron beam. Electro-magnetic lenses focus the electron beam on a cell sample and an image is formed on an electron-sensitive photographic plate.

  1. The eye.

    Also means only a vague picture of the object even in the brightest of light can be seen with only rods. Greater number of rods around periphery of retina. Dark adaptation - when entering a dark room after being in bright light, takes several seconds before objects distinguished clearly.

  2. History of the Microscope

    Ebert, a German bacteriologist, employed a compound microscope in his discovery of Eberthella Thyphosa. It was also a compound microscope that Robert Koch discovers tubercle and cholera bacilli. The 19th century saw dramatic progress in the development of the microscope, thanks to the contributions of such great minds as Carl

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