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# Lab_8 - seen and object and image are a focal length away...

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Introduction: Geometrical optics is commonly referred to as ray-tracing. We try to understand how lenses and mirrors will behave by graphically following the rays of lights through the instrument. Objective: Experiments 1 and 2: In these experiments, we observe and measure the focal length of converging lenses. Experiment 3: The objective of this experiment is to determine the focal length of a diverging lens. Experiment 4: For this experiment, the objective is to study the magnifying properties of a converging lens. Experiment 5: The objective of the experiment is to make a telescope and use it to determine the magnification. Experiment 6: The objective of this experiment is to construct a microscope and use it to determine the magnification. Methods and Apparatus: The apparatus used in all experiments consists of a piece of ground glass, a mirror, and aperture, and several lenses. Experiment 1: Focal Length Coincidence Method: Set a mirror behind the lens and move the lens between the object and the mirror until an inverted object can be seen. When the inverted object can be

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Unformatted text preview: seen, and object and image are a focal length away. Experiment 2: Focal Length – Lens Formula: Use the ground glass to get an image of the object. Calculate the focal length from the object and image distances. Experiment 3: Focal Length of Diverging Lenses: Combine the diverging lens with a known convergence lens. Measure the focal length. Experiment 4: Simple Magnifier – Loupe: Use the object and ground glass to observe the magnifying properties and to measure the maximum magnification. View a piece of ruler with the same lens and estimate the magnification. Experiment 5: Astronomical Telescope: Construct the telescope using the 25 cm lens for the objective and the 5 cm lens for the eyepiece. View a piece of ruler and estimate the magnification. Then view a bright object across the room. Experiment 6: The compound microscope: Make a microscope using lenses #6 and #7. View the ruler attached to the object and estimate the magnification....
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Lab_8 - seen and object and image are a focal length away...

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