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Scopes

Scopes. A microscope is a compound lens system designed to create high magnification. The intermediate image is magnified Real image The rays emerge parallel after the eyepiece. Acts like magnifying glass. Microscope. eyepiece. intermediate image. objective.

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Scopes

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  1. Scopes

  2. A microscope is a compound lens system designed to create high magnification. The intermediate image is magnified Real image The rays emerge parallel after the eyepiece. Acts like magnifying glass Microscope eyepiece intermediate image objective

  3. Microscopes try to maximize objective magnification. Large image distance Use focal length nearly at object distance Tube length L The object is close to the objective. Small focal length Object just beyond Objective

  4. The eyepiece magnifies the intermediate image. Near point distance dn Take near point to be 25 cm Short focal length fE Total magnification is the product. From x15 to x1200 Image is virtual High Magnification

  5. Refracting Telescope • A refracting telescope is designed to magnify a distant object. • Object light rays nearly parallel • Final image rays also parallel primary focal point eyepiece

  6. The telescope intermediate image must be real. Distant objects very large Minimize intermediate to fit in tube Long focal length Long tube The eyepiece then magnifies the intermediate image. Short focal length Tube Length

  7. A reflecting telescope combines a focusing mirror and a lens. A single curved mirror and lens is a Newtonian reflector An initial lens before the mirror is a Schmidt-Cassegrain Reflecting Telescope secondary diagonal mirror primary mirror eyepiece

  8. A spherical lens does not exactly focus all parallel ray to a point. Thin lens is approximate Real lenses have blurred edges called aberration. Spherical aberration from spherical lenses Chromatic aberration from different wavelength bending Aberration

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