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Draw a ray diag to show the image formation by a refracting astronomical telescope at the near point adjustment .Write down the expression for its

magnifyiing power . How does the magnifying power change when the diameter of its objective is increased to four times its initial value/



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 Hi students!
The magnifying power of a telescope remains unchanged when its objective aperture is changed. Hence, the resolving power of the telescope also increases with the increase in aperture of the objective.

Kindly find the attachment, which includes the final image at the least distance of distinct vision and the image at infinity.
Well the magnifying power = f(objective)/f(eyepiece)
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