Question

Experiment 22: The Compound Microscope f2 Object 2 1 (Objective Lens)d L, (Eyepiece) d#150mm The Compound Microscope A compound microscope uses two lenses to provide greater magnification of near objects than is possible using a single lens as a magnifier. The setup is shown above. The objective lens, L1, functions as a projector. The object is placed just beyond the focal point of L1 so a real, magnified, inverted image is formed. The eyepiece, L2, functions as a magnifier. It forms an enlarged virtual image of the real image projected by L1 The real image projected by LI is magnified by an amount m·-di/do, as indicated by the Fundamental Lens Equation. That image is in turn magnified by the eyepiece by a factor of 25 cm/f (see Experiment 20: The Magnifier). The combined magnification is, therefore: M。 (-di/do) (25 cm/f). Setup the microscope as shown above. Use the 75 mm focal length lens as the objective lens and the 150 mm focal length lens as the eyepiece. Begin with the objective lens approximately 150 mm away from the object (the Viewing Screen). Adjust the position of the eyepiece until you see a clearly focused image of the Viewing Screen scale. 1. Is the image magnified? How does the magnification c length lens alone, as a simple magnifier? ompare to using the 75 mm focal While looking through the eyepiece, slowly move the objective lens closer to the Viewing Screen. Adjust the position of the eyeplece as needed to retain the best possible focus. 2. Why does the magnification increase as the objective lens is moved closer to the object? 3. What focusing problems develop as the magnification increases? Use the Variable Aperture to restrict the path of light to the central regions of the objective lens. Vary the size of the aperture and observe the effects on focusing . What effect does the aperture have on focusing? 5. What effect does the aperture have on the brightness of the image? 6. What advantage would there be in using a 75 mm focal length lens as the eyepiece?

Answer 1

ave mode the mogrilycaltion increass because when he object iu Catan ancreau dsontcelly, up until ase Ar magngaten increa. tale. It has be Jocund delictly, in genaal Jor good imge to be shoan. Te Coler oberration aso ec i proninerdt. Te Tay aba biy bet moe, sa te aler vill be mare disploced a well si t small opactiou heoev to highes

Because, ls averali linlt i gelin u gene omeunt ligt decrees, theug st i lihy e