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In telescopes, at least two converging lenses are used: one for the objective and one for the eye piece. These lenses must be positioned in such a way that the final image is virtual and very much enlarged. In terms of the focal points of the two lenses, how must the lenses be positioned ?

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Q1
In telescopes, at least two converging lenses are used: one for the objective and one for the eye piece. These lenses must be positioned in such a way that the final image is virtual and very much enlarged. In terms of the focal points of the two lenses, how must the lenses be positioned ?
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Q2
Two convex lenses, of equal focal length but of aperture A1 and A2 (A1> A2) are used as the objective lenses in two astronomical telescopes have indentical eye-piece
Compare the ratio of their
I) Resolving Power
II) Normal magnifying power
III) Intensity of the image formed by them
Which of the telescopes should be preferred? Why?
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Q3
Case-III :

A compound microscope is an instrument which consists of two lenses L1 and L2. The lens L1 called objective, forms a real, inverted and magnified image of the given object. This serves as the object for the second lens L2; the eye piece. The eye piece functions like a simple microscope or magnifier. It produces the final image, which is inverted with respect to the original object, enlarged and virtual.

What types of lenses must be L1 and L2?

[ 1 Mark ]

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Q4
A compound microscope is used to enlarge an object kept at a distance $$0.03\ m$$ from it's objective which consists of several convex lenses in contact and has focal length $$0.02\ m$$. If a lens of focal length $$0.1\ m$$ is removed from the objective, then by what distance the eye piece of the microscope must be moved to refocus the image
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Q5
Where must an object placed in front of a converging lens so that the image formed may be upright and enlarged?
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