21. The objective of a telescope focussed for the least
distance of distinct vision forms the image 0.75 m
behind it. The distance between the two lenses is
0.80 m. What is the magnifying power of the
telescope? For seeing with relaxed eye, by how much
distance will the eye-piece have to be moved back?
What will be the magnifying power then?
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what the hell , i opened the app for seeing an answer but now i see nothing rather i myself have to solve this problem .