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 ,
where fo is 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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