(c) McGraw Hill Ryerson 2007 3.5 Extending Human Vision Microscopes A compound light microscope uses two convex lenses to magnify small, close objects.

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Presentation transcript:

(c) McGraw Hill Ryerson Extending Human Vision Microscopes A compound light microscope uses two convex lenses to magnify small, close objects.  Magnify means to make the image look larger than the real size. To focus the image, the object is moved closer to or farther away from the object lens.  Adjusting the distance to make the image clear is called focussing. See pages

(c) McGraw Hill Ryerson 2007 Refracting Telescopes A refracting telescope has a convex lens to collect and focus light from a distant object, and a convex eyepiece lens to magnify the image. Problems with refracting telescopes include:  Large objective lenses flex, due to their own weight and distort the image.  Glass lenses, even of the highest quality, absorb some of the light and are expensive. See page 219

(c) McGraw Hill Ryerson 2007 A reflecting telescope uses a concave mirror, a plane mirror, and a convex lens.  Light enters the telescope and is focused after reflecting off the concave mirror.  A plane mirror reflects the light towards the eyepiece.  The convex lens in the eyepiece magnifies the image. Most large telescopes are reflecting telescopes. Reflecting Telescopes See page 220

(c) McGraw Hill Ryerson 2007 Binoculars are actually two refracting telescopes mounted side by side. To shorten the length of the tubes in binoculars, prisms are used to reflect the light back and forth. Binoculars See page 221