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CBSE Class 12-science Answered

Define and write expression for magnifying power of an astronomical telescope in normal adjustment (i,e, when the final image is formed at infinity)  
Asked by khanhill543 | 31 Dec, 2020, 12:20: AM
Expert Answer
Light from a distant object enters the objective and a real image is formed in the tube at its second focal point.
The eyepiece magnifies this image producing a final inverted image.
The magnifying power m is the ratio of the angle β subtended at the eye by the final image to the angle α which
the object subtends at the lens or the eye.
 
Hence magnifying power m is given as ,  

begin mathsize 14px style m space almost equal to space beta over alpha space almost equal to space h over f subscript e cross times f subscript o over h space equals f subscript o over f subscript e end style
where fis focal length of objective lens and fe is focal length of eye piece

Answered by Thiyagarajan K | 31 Dec, 2020, 10:04: AM
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