Draw a ray diagram to show the image formation of a distant object by a refracting telescope. Write the expression for its angular magnification in terms of the focal lengths of the lenses used. State the important considerations required to achieve large resolution and their consequent limitations.

 

 

Answers (1)
S safeer

The angular magnification of refracting telescope is given as;

        

  m=\frac{-f_{o}}{f_{e}}

Where Objective focal length

 f_{e}= The focal length of the eyepiece

The important considerations required to achieve large resolution;-

\Rightarrow To achieve a large resolution, the objective of a large aperture is required.

Consequent Limitations;-

  • It suffers from chromatic observations.
  • It is heavy, so difficult to make and support by their edge.

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