collect at least six convex lenses of different thicknesses and apertures. Find their approximate focal length by making the clear image of a distant object on the wall and then measuring the distance between the lens and the wall. Select the best pair of lenses foe making a refraction type astronomical telescope. Write the criteria you have kept in mind while making the choice of pair of lens. Set the telescope for normal adjustment. Select a third lens to make the final image erect. Find the magnifying power and telescopic length in the setting.
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