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Mirrors and Lenses



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Physics    Waves and Optics   Mirrors and Lenses

Optical Instruments

Telescope

                   A telescope is an instrument designed for the observation of remote objects and the collection of electromagnetic radiation. The telescope is used to provide angular magnification of distant objects, made up of an objective and an eyepiece. The two lenses are arranged so that the objective forms a real, inverted image of the distant object very near the focal point of the eyepiece. Because the object is essentially at infinity, this point at which forms is the focal point of the objective. Hence, the two lenses are separated by a distance (f0 + fe) which corresponds to the length of the telescope tube. The eyepiece then forms, at I2 , an enlarged, inverted image of the image at I1.

        

The angular magnification (m) of the telescope is given by [θ/θ0] , where θ0 is the angle subtended by the object at the objective and θ is the angle subtended by the final image at the observer’s eye. Finally the angular magnification (m) of the telescope can be expressed as,

 
          

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